Malicious PDF — malware analysis report

Static analysis result for SHA-256 608cbb3931f0f833…

MALICIOUS

PDF

69.4 KB Created: 2020-12-14 23:01:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: eb9aea1af729233520c387f441ee1629 SHA-1: 91180deaa6ef5c8e705c319447c5a0733e2a226c SHA-256: 608cbb3931f0f833a4d9b9e3c7aa1e867eeabd0ee8dfb4342bfd5e41f7624221
164 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. It uses an urgency-based lure. 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 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafftec.ru/123?utm_term=the+last+jedi+novel+pdf PDF link annotation
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/6182312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_5fa7e04707166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422638/normal_5fa688dc5d370.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd0b1267-3633-4abd-8fff-2d0afebb4074/motor_speedway_of_the_south_ebay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f89bd0-4e6d-4629-badf-7a76f2b9bfdd/tujakama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd9fac9-aed3-419a-b42c-c9539b488edb/93800880597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d474ecc1-9f05-4cf9-b5e1-7f156ea4432d/zekujipofipo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcecc3225f96d1b32d21edb/t/5fd5fd0cb1c3f31c7a76de91/1607859477650/merimejaxebodaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b70ba3-d268-4a5a-a577-c561404777fc/clash_of_clans_apk_mod_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b31af8-88ff-4871-88ad-b718648ff1e6/kufujugej.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5add2104edf1d77a1d016/t/5fd61d8d3ebe0416315755e8/1607867796070/45205512855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/285079fc-0f56-4221-a2f0-c0d82aef646d/90921544813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e93aa8-6894-4024-99fd-7cb625d056bc/96360086035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f219de3f-0ddb-4d9d-af02-2ab943ae4848/cascada_everytime_we_touch_album_download_zip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f313417a-ab69-46e2-bf5c-184953062692/faginiwunadeb.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29D 5116 bytes
SHA-256: f5416602f286cb79e40a8ce0c7f6f93320ea5d75f55ce5b6f809897c94022b7f
font_01_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 10808 bytes
SHA-256: e774b9c96665153e34dee8b25f745e75ab60865887a36eab71fddf11b6b05f90

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