Malicious PDF — malware analysis report

Static analysis result for SHA-256 581a69838956935d…

MALICIOUS

PDF

109.2 KB Created: 2021-03-28 20:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f090e3c849bf2fe040cb4432b2a59457 SHA-1: 9fade91b8d829586c795f393dd827440102db806 SHA-256: 581a69838956935dbae7301b6d49fc8b5607da049edc869a961e9c7d840f97dc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9817

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/award?keyword=ordinal+numbers+1+100+in+odia+pdf PDF link annotation
    • http://levantegroup.net/ipod_nano_7th_generation_for_sale_uklnnmn.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/iafgfOt/tazamirosipegesevijived.pdfIn PDF document text
    • https://zumaraje.weebly.com/uploads/1/3/0/7/130776401/gokepafubev_relaxoge_wesitoz_bajubumadawu.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/dujumerawowijor.pdfIn PDF document text
    • http://dorightunion.com/android_oyun_club_gta_vice_city_indifyeky.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/hHKj1gd/25843456574.pdfIn PDF document text
    • https://pesirirovozag.weebly.com/uploads/1/3/4/3/134316115/pidevog.pdfIn PDF document text
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/272119.pdfIn PDF document text
    • https://mokabeninenaji.weebly.com/uploads/1/3/4/0/134013120/sosisanisediwogoti.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/Ezk8ifn/child_care_package_nsw.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/ij39ibF/find_my_phone_app_for_android_and_iphone.pdfIn PDF document text
    • http://sendgrid-de.com/kong_godzilla_trailervrarm.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/gmjhejy/the_last_stand_union_city_whistlers_forest_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/ihiPjdv/yaad_aayenge_school_days_song_lyrics.pdfIn PDF document text
    • http://ing-cliente.com/why_me_lds92b72.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/hNFajHv/3175097560.pdfIn PDF document text
    • https://cdn.sqhk.co/xugumewaz/cjchhgc/vermont_national_and_state_parks_in_arizona.pdfIn PDF document text
    • https://cdn.sqhk.co/niwuruba/ifhajdC/koravolakaron.pdfIn PDF document text
    • https://cdn.sqhk.co/buzovegom/Tcf8hhf/15696923885.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/gjZii1c/wozokurajamamedo.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/kTP9ghC/jepufivimurafef.pdfIn PDF document text
    • http://smartcoin.design/zegujoxerosexgjii.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/9gc0kij/kitikutinalovegifela.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e1542e-d7e7-4b89-9576-5396fe31ca0a/30851704056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122ead45-7c72-4e47-b801-fffd5de4bb9f/mous_iphone_11_pro_case_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da3c354-95d1-4930-98ab-ffa42ff1e434/siemens_hearing_aid_price_list_2018.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 7448 bytes
SHA-256: 46500d3ee8c9e2247138988c803490a864fd29cf51f15776aff67571baa15f6e
font_01_sfnt_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 5548 bytes
SHA-256: a552fb9a98879c63c0fd170f99a84ebed29609ee4c1d6a629a95b491cca20ce5
font_02_sfnt_off00013592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13592 13676 bytes
SHA-256: f30f63476692ace6abf8cdefde7e684adc225720293f9b947dd2baca62781bed
font_03_sfnt_off00015f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2F 16232 bytes
SHA-256: f1d828cd7902bfa7d0a3b3055dce092d10e3e7e60c91f73bb530ab1d5dcd46a7
font_04_sfnt_off000174d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174D1 15648 bytes
SHA-256: ff784d75ab35b5dd7f1254ba990364adfc6098c8ee004850ddfb9e87d832c8f3