Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2090bf14c754569…

MALICIOUS

PDF

84.1 KB Created: 2021-01-10 19:51:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 6f664ad8aa19ae34c959d2f94010726d SHA-1: 4e18785b42ed3ece14bd7a5d5565357feb1bc294 SHA-256: a2090bf14c75456905480437b89e539765de390b08674ad0fc038a33cc7a1686
156 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, exhibiting characteristics of a phishing or SEO link farm attack. It contains a large number of external links, with one pointing to 'https://trafffe.ru/123?utm_term=finishing+dissertation+tips', suggesting a potential phishing lure or a mechanism to drive traffic to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the distribution of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=finishing+dissertation+tips PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f8762b2472aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463785/normal_5fc7bdc368c5d.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxiniraz/gihfVgf/36297600995.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/G66je6c/58055276310.pdfIn PDF document text
    • https://kiloroxo.weebly.com/uploads/1/3/0/8/130813762/8609559.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/578163.pdfIn PDF document text
    • https://velabusodogir.weebly.com/uploads/1/3/1/8/131858366/78d8047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469135/normal_5fbd9f68a6fec.pdfIn PDF document text
    • https://sowekunozo.weebly.com/uploads/1/3/5/3/135321923/jazikelajarijabor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_5f8b24dd5fb8e.pdfIn PDF document text
    • https://tumipipap.weebly.com/uploads/1/3/4/5/134598024/6071547.pdfIn PDF document text
    • https://tebefatudu.weebly.com/uploads/1/3/4/3/134329870/pepukuturiti.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/legipalofi/68550212685.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/51108469625.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/cessna_172_weight_and_balance_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/735009495.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/project_costing_sheet_in_excel.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_off0001034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034E 5144 bytes
SHA-256: e162c8733e94ac17d1590973ea4af829e806e474d1550841bf721778a7ce0e97
font_01_sfnt_off000114c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 1948 bytes
SHA-256: 451660d9099b5b7a961518735af3bbbd9fc8b9513cf5b40421d618a4cb4930e2
font_02_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 10900 bytes
SHA-256: 228eccafc917f2849674bd97b95e3f1b2cbd84598c3620fd6a99a98f06ff37d7

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