Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b0ab422e15b598…

MALICIOUS

PDF

72.3 KB Created: 2021-02-16 13:09:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 760dc6c7c018ec3c273070d8aecedcf1 SHA-1: dbdb976bd1f0dca2b7cdb425581c42c5dd2450f7 SHA-256: 37b0ab422e15b598de502b25234738ddb4aac9d7a94b57e067e82d0a98c21c33
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO spam operation. One of the primary external links points to 'baarspo.ru', which is likely part of the malicious infrastructure. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://baarspo.ru/wb?keyword=what%20is%20not%20a%20reason%20why%20the%20renaissance%20began%20in%20italy PDF link annotation
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/ca16a6a55c6a9ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fc87e817d2a3.pdfIn PDF document text
    • https://gilinolejokakis.weebly.com/uploads/1/3/4/6/134632374/b303917a833b6.pdfIn PDF document text
    • https://kodetinerimaguw.weebly.com/uploads/1/3/5/3/135347088/3546516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_60155378ad07d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491725/normal_6012d1557964e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492593/normal_5ffcb211c544f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/java_bounce_tales_game.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/die_hard_battery_charger_and_maintainer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/taxiwiduximabuw.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/551791507.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/vte_guidelines_chest.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B2 5196 bytes
SHA-256: c58c3b6a3d8d83170db2b1df93ecd58ab116578e0b3be24714198ea785b9a447
font_01_sfnt_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 10360 bytes
SHA-256: 4ee5359572e8c53d696d368b54c87e624b4964375e77a339cdf6293c997e8807
font_02_sfnt_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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