Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05b19d4033fcd3c…

MALICIOUS

PDF

75.9 KB Created: 2021-02-05 11:19:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a1bcd2957eb96c54ebb8eb822f1b4c9c SHA-1: 14fa7bbe179a3519d02a0acf3e6e0fc89a67b02b SHA-256: a05b19d4033fcd3c4f6a78d885a978da7930c8360580ad8b5cb8b62d007b7fdf
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 of which point to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=mrs+flowers+story+questions+and+answers PDF link annotation
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/zexoxutiruzi.pdfIn PDF document text
    • http://batut.space/boky_mainty_libresoqkzh.pdfIn PDF document text
    • http://ruwegekugite.22web.org/petosojixisanudowuz.pdfIn PDF document text
    • http://b0xberry.online/moneygram_store_hours_near_meh50fg.pdfIn PDF document text
    • https://nidikibadut.weebly.com/uploads/1/3/1/4/131453007/tisonuzudapiwigosow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472200/normal_6002426b5e88c.pdfIn PDF document text
    • http://submonster.xyz/come_thou_fount_kings_kaleidoscope_chordsqnw59.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/salosibejodod/zimaso.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/tuzage.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/australian_passport_renewal_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/wafofa.pdfIn PDF document text
    • http://kiwusumusi.rf.gd/abundance_cheque_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/cessna_172_weight_and_balance_sheet.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_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 5224 bytes
SHA-256: 40cc3daeb45ac94d788664585f870083c5cab78b8aef43f4725c6701e845ccc9
font_01_sfnt_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 11016 bytes
SHA-256: efde028bfd3565d1a67c1c5681780aa519e43575dca807b9cb156659e090fc70

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