Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b0e5d1f92f9048…

MALICIOUS

PDF

70.8 KB Created: 2020-11-13 21:58:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ec813c634523d380b6a085284b040b5b SHA-1: 135cca77d22498948eecf1b20d8a5ac2672483e5 SHA-256: 39b0e5d1f92f9048ccb1af48be93c4a5a405b3743cebdbdbcdf16ff1fa789b9a
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector and a link farm. It contains numerous embedded URLs pointing to external PDF files, suggesting an attempt to manipulate search engine rankings or distribute further malicious content. The presence of a link to 'traffine.ru' further indicates malicious redirector activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=going+on+a+bear+hunt+lyrics+greg+and+steve In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_5f9351263c3bc.pdfIn PDF document text
    • https://doxeduzawixufak.weebly.com/uploads/1/3/4/3/134383044/pubeseladet_xudiv_vivepikivax_gatatase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_5f9996e511107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_5f9f3de0764c7.pdfIn PDF document text
    • https://nikokitigo.weebly.com/uploads/1/3/4/5/134500207/69855f814e0e36d.pdfIn PDF document text
    • https://zivexipoter.weebly.com/uploads/1/3/1/4/131483036/telaku_gajejokewuk_bozexuletokepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_5fa365ed35a84.pdfIn PDF document text
    • https://kutisujazuj.weebly.com/uploads/1/3/4/6/134625744/29b779a57c246.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/17906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/tigeri.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_off0000cd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD85 5532 bytes
SHA-256: 968b1f3d93dd68f09a7a48b703ca0116e7c1d84d3289de0ef74f8c118a7bcaed
font_01_sfnt_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 1752 bytes
SHA-256: 94c54e275d677d0d4bc961fa18a087334d79a4a27865e9b9abb55883a4e6d84e
font_02_sfnt_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 10992 bytes
SHA-256: a74b013583e591c3f48e15833ae846dcda590b7556137b5e7dd8b75705522a6a

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