Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed51230fed1dfc4…

MALICIOUS

PDF

75.5 KB Created: 2021-04-10 06:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a8035fddad3ac286232903f64b049cb5 SHA-1: 9570a53b5b483a89ad052513d9c990eb2bb0f2c0 SHA-256: 4ed51230fed1dfc40013172e6ac99c8c85e86dbe4c945fc868c8dbaa64e2bd8a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, which is characteristic of a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, likely as part of a phishing or SEO spam campaign.

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.
  • 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://bologen.ru/strik?utm_term=how+to+study+physiology+in+mbbs+quora PDF link annotation
    • http://jolixasij.sportsontheweb.net/vocabulary_workshop_level_c_unit_12_synonyms_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418383/normal_606cf1b87de45.pdfIn PDF document text
    • http://wanezus.scienceontheweb.net/baregapijajufapov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389127/normal_5ff5855301a86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483338/normal_6056069d5d1ae.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/atjiBWY/dialysis_center_requirements.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446634/normal_605960afb3feb.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/Cjai0gg/us_dog_fighting_planes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9aef9be9-4304-4ec6-b02b-ded1eabc5d1b.filesusr.com/ugd/a571b8_1474854994204e9f9406c4d0aee2224e.pdf?index=trueIn PDF document text
    • https://489a076c-e753-49d8-be98-eafe91fb8f34.filesusr.com/ugd/136d07_835828c4b0a84c4080ce57ec07c06ef0.pdf?index=trueIn PDF document text
    • https://f8bd9030-4518-40b4-9047-d478e6ffc17b.filesusr.com/ugd/608fe2_0101de9ccd69476dad809ef857b2ef67.pdf?index=trueIn PDF document text
    • http://fajazimigig.atwebpages.com/zituratewetumoped.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/libro_agorafobia.pdfIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_38863b5e391e4c059a1dd989072d629c.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_247a280f31f64a41ab962eec2bd57917.pdf?index=trueIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_43870b2fdada425fac4c6521b20e3749.pdf?index=trueIn 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_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 5792 bytes
SHA-256: 1bf9aab2e2c935c6960c808baed5babdc8db6eec1b02be99824b5d5519fcf9df
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 10772 bytes
SHA-256: 9858f6535a461b995bae33fc947087513a949292e3f68390f9850c20b5e8ea00

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