Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7304b8ee525c2c3…

MALICIOUS

PDF

70.0 KB Created: 2021-06-04 03:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ff6003324a0eaf54bd5e85c3f673fdb3 SHA-1: e3e3b986f9bd47b05c1fbdcc22631d2a0baab1d5 SHA-256: f7304b8ee525c2c358ee3f638161e9ef0230cc32fcdf030f67ff1a109b3d6b8b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that point to other PDF files hosted on various domains, including disposable ones. This technique is commonly used to obscure the ultimate destination and potentially distribute phishing content or malware. No scripts were extracted, but the structure suggests it's part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/pbw?utm_term=download+battle+trip+ep+153+sub+indo PDF link annotation
    • https://jaxufeloz.weebly.com/uploads/1/3/4/0/134013101/9854126.pdfIn PDF document text
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/6735286.pdfIn PDF document text
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/movabobijom_xilegivaworer_nididinexijepo.pdfIn PDF document text
    • https://tidovikazixuwuj.weebly.com/uploads/1/3/4/3/134316919/6283bd17cd3373c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471114/normal_5ffaed7f1861e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427544/normal_602f4b5a47c30.pdfIn PDF document text
    • https://lilafigofuku.weebly.com/uploads/1/3/1/3/131398347/suvomevoxoz_tejeroxukogat.pdfIn PDF document text
    • https://dewixazupeteti.weebly.com/uploads/1/3/1/4/131455636/zafunufovira_kixatakexaf_vewixolefin.pdfIn PDF document text
    • https://bumipavadawafez.weebly.com/uploads/1/3/2/7/132710759/3934977.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486975/normal_5ff1f3450c003.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fceea572c3f2.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/60860bff-0084-4167-9831-b7eb97e4ad7f/82360336894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/654a8df4-8e99-4d2b-ac38-ceb4eca37e40/49220141275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d579e9-127e-4192-8370-a76461d7f1ac/lireguripawuwozagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c77de7a-6ed1-4841-9053-b3e605f7ed73/why_is_my_milk_frother_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503dfcda-d0f2-4a75-b593-f6d1ed708cc0/49531533405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a95b6b-0641-4258-b02a-729293257108/calculating_annual_leave_for_part_time_employees_ireland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d26eaa-a457-4306-87b1-6b51111062c8/97318233869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b70a97-041b-457a-b31c-1c92dbfe0b96/54059184780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f0f3225-77c3-4da9-a86e-fb6e90b9a222/sibelius_6_keyboard_shortcuts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8113762c-f826-4a66-ae53-831aeba183eb/59412552201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b9ed0e-2809-4e28-b8a9-acbab48e7a84/26763480769.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_off0000d2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C4 5524 bytes
SHA-256: 2dff35eed042d5731f382fdb93c694529a7eb5c00f4440c702a634670cc3d012
font_01_sfnt_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 11320 bytes
SHA-256: 5bef9a72c398ed95a599906192fda7573df0f6f1beae4c3a1463e2d5e1ae5521