Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71a4061f8c474fb…

MALICIOUS

PDF

112.5 KB Created: 2021-06-09 07:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d8ae9d2e36936f2338b5667078ce3e4d SHA-1: 27157e72bda02d2d5cc7989f27be71c276564bc7 SHA-256: c71a4061f8c474fb22f6b4ee5098b41434ee8e2d8370c6d3ee3a1ee740519b1f
186 Risk Score

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 0.9965

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://fokemale.ru/123?utm_term=pioneer+n50+manual+pdf PDF link annotation
    • https://fejomuzuzozasas.weebly.com/uploads/1/3/4/7/134748710/1133661.pdfIn PDF document text
    • https://linonorimezolup.weebly.com/uploads/1/3/7/5/137519838/pogenuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_6036c10e50bbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_602ec8f0db636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_60bc37490bab1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378853/normal_5ffb8e1edb5ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451545/normal_6041b90d55529.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444102/normal_5fddfc667194b.pdfIn PDF document text
    • https://zeleveruki.weebly.com/uploads/1/3/4/8/134898901/e09d9035605.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369503/normal_5ff7c0ae77119.pdfIn PDF document text
    • https://sevizigetumopib.weebly.com/uploads/1/3/4/0/134042829/pogofozoxero.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374860/normal_6000199ca96e7.pdfIn PDF document text
    • https://xijegubusogo.weebly.com/uploads/1/3/0/7/130739006/7978008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476416/normal_5fed033b93d19.pdfIn PDF document text
    • https://nudametuwino.weebly.com/uploads/1/3/3/9/133997501/3870369.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_5fcceb7876a0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446019/normal_602c6b7ac0557.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4481161/normal_60b2f22091caa.pdfIn PDF document text
    • https://patobozojewe.weebly.com/uploads/1/3/4/8/134863794/fubezudadawisunas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451941/normal_5fda4f548b5b2.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/5bb61e55-c285-4354-938c-c4dc45998f6f/how_to_stop_microwave_beeping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f7e153-7d0d-4aa3-ae64-eefeb245551f/95277713041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4675b44-07e0-46f1-9520-e32981600754/zanuvilaminedipimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa19c4a-9d07-4767-a763-9ae53f123804/hp_deskjet_3054a_printer_ink.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B89 3220 bytes
SHA-256: 9a3381c63b22a6734827b853e2ac17de0aa44b69db9ee2fc10393c4e7ed7640d
font_01_sfnt_off000166ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166EE 5276 bytes
SHA-256: f9ec9642049005bebf4de631f2057d5c292eac81f7d7f6b3ea37bada064cb325
font_02_sfnt_off000178cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178CF 10760 bytes
SHA-256: 0aabf6c2eab04cb3c6a157e935989f75cdf17d3a6c5bf9f359be19e07b596c33
font_03_sfnt_off00019dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DD3 16176 bytes
SHA-256: 8324733d7480d7083481c437d1525093cd57dbf996458dd65d56211ed193d4cf