Malicious PDF — malware analysis report

Static analysis result for SHA-256 f285e8124b888e49…

MALICIOUS

PDF

76.0 KB Created: 2021-04-06 20:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: feae930162fc5766613571e0691dcdea SHA-1: 30008b0d67c91423482076d4dab3623c15188565 SHA-256: f285e8124b888e49663ca19b3d22fdd9e52bfd903bd85b09d7bb5a0a245f0c30
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/award?keyword=transistor+2n2222+pdf PDF link annotation
    • https://bezujopejot.weebly.com/uploads/1/3/1/6/131606295/1874801.pdfIn PDF document text
    • http://samudevupogawi.iblogger.org/71647610432.pdfIn PDF document text
    • http://kozodomu.22web.org/18354887553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450733/normal_60665bd94b33b.pdfIn PDF document text
    • https://sowefitubi.weebly.com/uploads/1/3/1/4/131406610/5452125.pdfIn PDF document text
    • http://jafetezaki.iblogger.org/anatomie_de_l_appareil_urinaire_masculin.pdfIn PDF document text
    • https://navikeput.weebly.com/uploads/1/3/4/7/134755574/9417892.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370791/normal_5ffdd008b8eae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafazexetoraxik.epizy.com/i_dreamed_a_dream_glee.pdfIn PDF document text
    • https://a5f97fb6-6895-4a42-8c51-2de4018fe37d.filesusr.com/ugd/1eae48_dc82655895d2415cb3cfbe65ddfa22c8.pdf?index=trueIn PDF document text
    • http://vifogigamoge.rf.gd/flat_belly_diet_plan.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_af00f2c26171456eb0113f86f1b4a906.pdf?index=trueIn PDF document text
    • http://jogilajixetevub.rf.gd/placenta_praevia_rcog_2020.pdfIn PDF document text
    • http://pupajuxefelere.rf.gd/2916820776.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_d58c02ebdd1a4cf3891cc64bb3704146.pdf?index=trueIn PDF document text
    • http://zidabisix.epizy.com/math_worksheets_4th_grade.pdfIn PDF document text
    • http://takugiwem.rf.gd/xoxewokewakakijenegoxoba.pdfIn PDF document text
    • http://sexikiti.epizy.com/wikotowovup.pdfIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_393c745672484d55a653f436615e1e3c.pdf?index=trueIn 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_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 5084 bytes
SHA-256: 07e817b01d96851c4d4945b646581b075f40d63cc6765250f6f0df46e793ce64
font_01_sfnt_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 10320 bytes
SHA-256: a0db35795854558d25ec2583ded44148485eb9789962e4c2770aaff30f16fdd3

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