Malicious PDF — malware analysis report

Static analysis result for SHA-256 8744b7f0b0dfa893…

MALICIOUS

PDF

89.6 KB Created: 2021-03-10 09:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b28d193178e8d63439964d693c623d53 SHA-1: 55667d800e3d16f6ea1f84670fde8b619d3b2d38 SHA-256: 8744b7f0b0dfa8939d0730f90738d46f53e258d46924cecf000863e590a7a68c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable domains and hosted on services like sqhk.co, indicating a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the structure and numerous external links point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/award?keyword=garment+production+management+pdf PDF link annotation
    • https://cdn.sqhk.co/gawukale/DcfJgcg/loud_ringtones_for_hard_of_hearing_android.pdfIn PDF document text
    • https://cdn.sqhk.co/tefivezik/hiihfL6/tibosolikekimijerozodin.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/dojivatuxoneta.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/aMbrf9R/download_game_true_surf_mod.pdfIn PDF document text
    • http://pemotutafid.mywebcommunity.org/public_speaking_rubric.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/brc6k5L/mini_golf_telluride.pdfIn PDF document text
    • http://rufawefojag.sportsontheweb.net/how_to_reset_citizen_promaster_watch.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/jdjjUcU/yeet_name_meaning_urban_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/ghyNgfY/75497618915.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/37392173485.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/bBifvzK/hearts_of_iron_sabaton_wiki.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/christmas_carol_go_tell_it_on_the_mountain_lyrics.pdfIn PDF document text
    • http://bugilinupapud.mygamesonline.org/4001487789.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_1909994fd5834b2b91aa3aed8c0c8f8a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/78704722588.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/wotugedoxisapolu.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/baixar_viewer_apk.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/scansnap_s1300_setup_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/fasigogunesezuxorololos.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_1e028ebe1c7b4d5a89da44c73f44373c.pdf?index=trueIn PDF document text
    • http://faxiruvud.myartsonline.com/how_big_is_30_by_40_inches_in_feet.pdfIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_0b274166b6e847abafed132beccb33be.pdf?index=trueIn 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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 5296 bytes
SHA-256: a9d2b6c73aee23a7559553b1c2e8186132f99627cccc0a777eb8430436939431
font_01_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 10672 bytes
SHA-256: 2a9b9031beee267bac6d7a0ec4abdc94f596ad9eff8bf866637a1b92ae7af630
font_02_sfnt_off000143d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D1 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf