Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5b3ed56873babf…

MALICIOUS

PDF

90.9 KB Created: 2021-04-08 07:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: beb350e07a4194ec25e3331e1315daf2 SHA-1: 1850f73c185ef678b29e7b5f81b9d5f6e207e663 SHA-256: 6b5b3ed56873babff249e1c72f78bcd8157ce01f3077f232bbefde381c6ccfce
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=bill+nye+atoms+and+molecules+video+questions PDF link annotation
    • https://cdn.sqhk.co/zirevazul/dLytPed/11021137476.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/RzVVjbX/flipkart_online_shopping_app_login.pdfIn PDF document text
    • http://zajowuresa.iblogger.org/cite_mla_8.pdfIn PDF document text
    • http://tells.fun/ralovijojuxikemi3ccs9.pdfIn PDF document text
    • https://dozisinabi.weebly.com/uploads/1/3/4/6/134646642/8248893.pdfIn PDF document text
    • https://cdn.sqhk.co/rilaraviror/hjBgcke/selena_tips_mobile_legends.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/deIbMxR/4510698424.pdfIn PDF document text
    • https://nusuwexob.weebly.com/uploads/1/3/4/3/134352417/gigamoge_jadodazur_somivetojefan_rajodovejujufu.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/jsihw8E/99919614087.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/nexufogig.pdfIn PDF document text
    • http://nakanilo.club/att_u_verse_tv_schedule_todaysq7n0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuleborujakojij.rf.gd/6409467013.pdfIn PDF document text
    • http://kiwasebax.epizy.com/56548283110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad650123-acd0-496a-aa64-0f5ea3a6f1a3/toshiba_dp5022-sd_user_manual.pdfIn PDF document text
    • http://ritebononopa.epizy.com/28786827783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a2c9803-5635-4be6-a3b8-481aa05599ff/ridgid_12_gallon_shop_vac_filter_removal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3649d32e-bbbe-45ef-a82d-c6c17bbe217b/reflexive_verbs_spanish_activities.pdfIn PDF document text
    • http://selifesupenikiv.epizy.com/laten_informeren_synoniem.pdfIn PDF document text
    • http://xofuzugavup.epizy.com/pujepe.pdfIn PDF document text
    • http://diretisen.rf.gd/knee_exercises_for_arthritis.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 7432 bytes
SHA-256: 297d22d4b50c98bd2e33d3bfa9665b37b846f3581b463b1692137ef75e67e352
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 2828 bytes
SHA-256: c6b9a904549e2c411ad948f98ab21dcae0351cdead509ebe8baf08aa5cb39c47
font_02_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 5324 bytes
SHA-256: 1c7831066be8c1b633bf075864403f006e08cc7f87b0dd1388cfa3de527d9517
font_03_sfnt_off000115b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 1884 bytes
SHA-256: 5f40e1ecd7255343b72b56cbc951fa77ccd3961d95643dc1ecc4b1a1fe3e0d44
font_04_sfnt_off00011ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 11156 bytes
SHA-256: 21e4db866e68658f47f4d976a41b3cb4dcce9fada017f9a99f39e3527e3d9b9c
font_05_sfnt_off00014540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14540 16320 bytes
SHA-256: 3fb36452a0ee0e29e7adafe6066b4614c131f9224666312af74b8c327e778b84

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