Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb315a8d0d11485…

MALICIOUS

PDF

78.8 KB Created: 2020-12-25 11:14:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3ec0993ed5e776099b7731737eb416b1 SHA-1: ecae70712064d2fa4e20216cd4a695b3e4bb3762 SHA-256: cfb315a8d0d114859066a3eae453824f5455f49670025e933f0e424dec4e4c78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL points to 'trafficel.ru', which is likely part of a link farm designed to manipulate search engine rankings or distribute malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The presence of numerous PDF links suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafficel.ru/123?utm_term=gymnosperms+and+angiosperms+have+in+common PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370267/normal_5fba375ddda5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447280/normal_5fd846b8ad96d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5fd203aa614e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_5fd3b6730ffc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472768/normal_5fda7b2c7770d.pdfIn PDF document text
    • https://desemezek.weebly.com/uploads/1/3/4/4/134458593/550195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5f9158a31c284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376103/normal_5f92e60178fd8.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/jamokaroxoj/run_a_virtual_machine_chromebook.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/zusote.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/22181087201.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/sejarisurutomakujexadix.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/34668261723.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_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 5356 bytes
SHA-256: fde99306cf04097619c3ede65bff76d3661fb7496d404a9ff1109b3b43bfa6dc
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 10704 bytes
SHA-256: e916a9ff1e6016f83997717fdb81c743bb4aab87cf437a6192e059977820295c
font_02_sfnt_off00011fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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