Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b3af44f1ac6321…

MALICIOUS

PDF

70.8 KB Created: 2021-03-28 14:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d7b3fa9ed128abb92be603ff181b7b38 SHA-1: da9d33620878a78bb60d886726c6ca77dfa78a51 SHA-256: a8b3af44f1ac63216d2eb0b2492f5ba0ab2f6b8035d9109ea5e4e5246baacda6
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/award?keyword=national+achievement+test+reviewer+for+grade+10+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451348/normal_604027813a21c.pdfIn PDF document text
    • https://goxezojukaruvuk.weebly.com/uploads/1/3/4/0/134000107/depujusigekelono.pdfIn PDF document text
    • https://sidatotivokusud.weebly.com/uploads/1/3/5/9/135959985/dafuxedejizaguv.pdfIn PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/xusotisanok.pdfIn PDF document text
    • https://tefuvorarap.weebly.com/uploads/1/3/2/6/132682785/sekexolewi.pdfIn PDF document text
    • https://fidexirubopuzer.weebly.com/uploads/1/3/2/8/132815065/voluxifajule.pdfIn PDF document text
    • http://migerov.xyz/mokovoxelacu88j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420434/normal_5fe5d0a1eac36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_eb75746f4d8e4acba828244423849e24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48543383-9b78-4805-a7d9-ff8c4808f82e/how_much_will_tesla_model_3_cost_in_europe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d8b4b25-4edf-42e1-903b-83c378c1e8db/the_little_match_girl_summary_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fba0af8-02f5-4c38-8646-93f1631130e2/13840457518.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_3c00192326c1405b9d2a6b676c11dc5c.pdf?index=trueIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_b2503551139c48d9a3e027574e0d311d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/528b54e4-5208-44f7-96c7-0cc76a977323/fundamentals_of_pathology_sattar.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_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 5884 bytes
SHA-256: 5713b9a9747fcdd0949b7ccf071c1bfaccc35e7aa2c94dafcd7b6954ab2ca280
font_01_sfnt_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 10592 bytes
SHA-256: 3c1385c3d697d78a7b375871c725e7adb545606776ae4d99acf4400658eacbdb

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