Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdf3fc7d60dc152…

MALICIOUS

PDF

76.4 KB Created: 2021-05-20 21:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fbcbd1c30a95998a72d8fb6eef034c12 SHA-1: 2f9cd4c56891fc10ef53cd2053e840a016325a71 SHA-256: efdf3fc7d60dc152f384e8c9f784eaabddbff95b03e13317c4e4ca3cbc63c0fd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicative of a link farm or phishing campaign. The document body, though heavily obfuscated, contains text related to 'pearson instructor access code', suggesting a lure for credential harvesting or further malicious redirection. The presence of multiple external URIs and a critical ClamAV detection strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/strik?utm_term=how+to+get+pearson+instructor+access+code PDF link annotation
    • https://lerojapozexux.weebly.com/uploads/1/3/4/0/134016693/febulavenusivedubote.pdfIn PDF document text
    • https://jaligudupu.weebly.com/uploads/1/3/5/3/135391073/4078581.pdfIn PDF document text
    • https://kobafadovuzek.weebly.com/uploads/1/3/4/3/134311208/5125352.pdfIn PDF document text
    • https://zimuvudiredefux.weebly.com/uploads/1/3/2/7/132710782/zudovavevavu.pdfIn PDF document text
    • https://polemezal.weebly.com/uploads/1/3/1/4/131452876/tunogeg.pdfIn PDF document text
    • https://netemadore.weebly.com/uploads/1/3/5/3/135306203/sawefevozepilod.pdfIn PDF document text
    • https://puzaloraren.weebly.com/uploads/1/3/4/5/134510283/6200983.pdfIn PDF document text
    • https://kofuwirobunugob.weebly.com/uploads/1/3/4/3/134318534/tatufezodev-pawolu.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/7441100.pdfIn PDF document text
    • https://rotisozag.weebly.com/uploads/1/3/4/6/134679288/75578f9.pdfIn PDF document text
    • https://nifusesoporiw.weebly.com/uploads/1/3/5/3/135309858/9415236.pdfIn PDF document text
    • https://topigofifudonif.weebly.com/uploads/1/3/5/3/135304546/xokugewiker.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/gofilafixu/7404258827.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/alpine_mrp-m500_bass_control_knob.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/gaxixedezudakafomapokew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5622b9e-cedb-49a6-90b4-567e4cfeca70/washington_dc_airport_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ddb91c-75f3-4dec-ac5b-aa762ee0878a/g_shock_casio_wr20bar_gold_price.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/bridges_in_mathematics_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/mrs_todds_shortcut_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14407441-fb48-4919-99e4-34a6f03bcf4d/tevufageweruwita.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/nutolixalasivis.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_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 5264 bytes
SHA-256: ecfdedfb7b9c857658173863cf93b521748a0bedf0a6aa8ce1d36ce84a616d22
font_01_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 10840 bytes
SHA-256: 6954caefc676fec3315aad9caba5050499dc6622edbdbdd267a649cbaa91cad9

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