Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2437d0a39182fb…

MALICIOUS

PDF

68.3 KB Created: 2021-03-17 16:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a84e6cfd4d54b5426c043cf2d97d68af SHA-1: 152f3cb0314bae782a2ec05512df02b6b3ff0529 SHA-256: 6c2437d0a39182fb90138be2c260861c8a7d5ba8b3917d7e8a6b967e11b8a503
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. An external URI pointing to 'dafemum.ru' was extracted, suggesting the document's purpose is to redirect users to a potentially harmful website. The document body contains garbled text, but the presence of the embedded URL is the primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=nonsense+words+list+cvc
    • https://cdn-cms.f-static.net/uploads/4501791/normal_602984eb646fe.pdf
    • http://gbo.guru/what_is_pharmacology_class_for_nursests7fa.pdf
    • https://cdn.sqhk.co/kiraxozi/9jdihjh/begufev.pdf
    • http://card2card-perevod24.site/37386705589rqafj.pdf
    • https://cdn.sqhk.co/kaxonavi/ghTHjjh/wojipefes.pdf
    • https://cdn.sqhk.co/lexuxeza/ic02gis/administration_dfinition.pdf
    • https://cdn.sqhk.co/pategazikiw/iafidhj/53378430629.pdf
    • https://cdn-cms.f-static.net/uploads/4388283/normal_6026bd702061b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rexogeguxosix/37590862773.pdf
    • http://tizidirek.rf.gd/speaking_test.pdf
    • http://divifafapinuk.rf.gd/fufebolubevurowemi.pdf
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_7458300adbeb467ea302758b3b518492.pdf?index=true
    • https://s3.amazonaws.com/jevelel/12_half_yearly_english_answer_key_2018.pdf
    • http://ganubigeponato.rf.gd/xokojojajedujukofomom.pdf
    • http://fadirekobesi.rf.gd/38569050596.pdf
    • https://s3.amazonaws.com/piwupevivotixi/adobe_audition_cs6_portable.pdf
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_ce3e41330305401fbc438f7f713ea300.pdf?index=true
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_467a3eff020e489d877fedf7f85967f2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccb6.bin
06c7877671d8b8ddd0e8d43508e7d4f4813ddb0feacd6a54754383dd663335d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB6 4844 bytes
font_01_sfnt_off0000dd58.bin
a4d1bd0ea3e3fef8fa771725c458d05478205d2a8a64bf939ce9f3884503b341
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 11028 bytes