Malicious PDF — malware analysis report

Static analysis result for SHA-256 4138eddb9c39e8aa…

MALICIOUS

PDF

68.5 KB Created: 2020-11-21 07:32:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 23881d8b10d5034f3e770cb2b7f6563c SHA-1: 3220a69a71b2bfa0011ca51ae5092a8071875956 SHA-256: 4138eddb9c39e8aa59ee3663f538668217dede9babd6115d0d154a03d3cec746
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing campaigns. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior. The embedded URL and the document body, though heavily obfuscated, suggest a lure related to human anatomy, likely to attract clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as phishing or a trojan.

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=most+important+parts+of+the+human+body PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379606/normal_5f8e486341b6b.pdfIn PDF document text
    • https://mubewawabover.weebly.com/uploads/1/3/4/4/134465459/2d4a660f7b16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5fa04f55e7007.pdfIn PDF document text
    • https://maxojemuv.weebly.com/uploads/1/3/4/2/134266220/sabobez.pdfIn PDF document text
    • https://guvodirafed.weebly.com/uploads/1/3/4/4/134475496/8adb28eecda.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/5829299.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/wazotojemov/kimahri_overdrive_list.pdfIn PDF document text
    • https://s3.amazonaws.com/rekibedafowow/jesifuto.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/10350063415.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/42843602386.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/que_es_la_acromegalia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0fe39c-36d7-4c4d-970c-ab172f03aa48/tri_med_transportation_llc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254fef0d-571d-4262-a9d1-22ebef3498b0/amoeba_sisters_worksheets_answer_key_bacteria.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/albumin_test_procedure.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 5496 bytes
SHA-256: 988ccd509a169ba749aa7fdbc49f2b936733fe55ac13e850aa17985c957378e1
font_01_sfnt_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 10192 bytes
SHA-256: 77bbf7c9db1d986cbdf46377d7b41015c826f48ccb45ad92466fcc7f5d96af9a

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