Malicious PDF — malware analysis report

Static analysis result for SHA-256 af63183d73ca3dd7…

MALICIOUS

PDF

81.2 KB Created: 2021-06-01 20:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 94ba4dc56b308220d02dcd699446ab09 SHA-1: 54d84315f6aee83dbee602259e6753ed5272901d SHA-256: af63183d73ca3dd76af53bf90caf1af7582b41fe12b7561df95976205c6436dd
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to leverage external resources for malicious purposes.

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://xezojetit.ru/123?utm_term=huppermage+multi+guide PDF link annotation
    • https://mubikopupisuf.weebly.com/uploads/1/3/4/7/134711770/vuxibefavorexanov.pdfIn PDF document text
    • https://nitipitu.weebly.com/uploads/1/3/0/7/130775162/152dc5f7f88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366358/normal_5fc8f395467bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_600d263b75db9.pdfIn PDF document text
    • https://joluduloj.weebly.com/uploads/1/3/4/2/134266967/nafujasosavu.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/pevobo-zupaxujo-sejolowutok-funadeg.pdfIn PDF document text
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/xegugonaxuwek-sezex-sijasiwemapikap.pdfIn PDF document text
    • https://xakolino.weebly.com/uploads/1/3/1/4/131453712/davorone.pdfIn PDF document text
    • https://sikukaposarimi.weebly.com/uploads/1/3/5/3/135307882/4669978.pdfIn PDF document text
    • https://vanosejifewufe.weebly.com/uploads/1/3/0/8/130814052/42de752.pdfIn PDF document text
    • https://wopufibirebosaw.weebly.com/uploads/1/3/4/4/134466277/kipoxazusimolezeza.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/5e8b8b43-3030-42bf-a5ce-1e789232b1d3/44617167263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c36a05-3635-476c-b598-9eb90863e0cc/is_potassium_form_covalent_bonds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf64481-e081-4b21-8f26-23741a3319c3/36237657807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c740e5f-235d-4203-b558-5c77d643801d/gutaxuvofinuxokebadeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a7ab3d-4f7f-47b5-b402-114f8053483b/environmental_science_crossword_puzzle_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fba2c910-0b56-49ad-ab8d-027f31e5873d/lomogemane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9fc6186-e350-4c05-b7d1-6f82dfef1c96/71102012529.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_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 5060 bytes
SHA-256: 97524e2156f2693e15c4af85c341ddfbb8644e4b27cd40a13a2f5654c828ccba
font_01_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 1940 bytes
SHA-256: c3676e60f3f5833abadf4665d825e842c25da1789a16c98cbf44dbe64159fc56
font_02_sfnt_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 12888 bytes
SHA-256: aa66e39ca5e601a4a2f779a6aa03dd658e4460158e7f7423be066b21dafaf8fd
font_03_sfnt_off00012102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12102 16560 bytes
SHA-256: 8519e3f3de14d58fff281f66b89339d06023368c3d47413938b15a9fc1ad05de