Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8b8370601fd3f6…

MALICIOUS

PDF

79.3 KB Created: 2020-12-15 19:12:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 184b1c112d27ab8480601a225d7ba6c9 SHA-1: 296c2cd05d85a33512095daf669b904c4f5cd3bb SHA-256: cc8b8370601fd3f617b1bff1681d2743f4c8e3c812b8bd7b6503ada54cba77de
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, appears to be related to a 'cook's essentials 6 qt pressure cooker manual', which is likely a lure to disguise the malicious intent. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://trafficel.ru/123?utm_term=cook%2527s+essentials+6+qt+pressure+cooker+manual PDF link annotation
    • https://nusavudusegi.weebly.com/uploads/1/3/4/4/134444144/xujapejujetuz.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/1256231.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/gakifuvakiveten_takojeros_gutafilusobifa_bokuvutepaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414868/normal_5f99dd6839134.pdfIn PDF document text
    • https://bijufipenonovo.weebly.com/uploads/1/3/4/5/134529550/zadaxavanevumiw_wipowufu_fudofuwata_tedubiro.pdfIn PDF document text
    • https://xiwapidijiz.weebly.com/uploads/1/3/4/5/134511693/dutuzuvodo.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/36ce75ac.pdfIn PDF document text
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/dejolitejelak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_5fbaab1c83021.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/9867142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f8829c3721e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5fa44785a900e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 5364 bytes
SHA-256: d79de497607ba302d624564af9cd4a88e0461432c58616a35963dce6edf43e77
font_01_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 11068 bytes
SHA-256: 60e57da64782c262de93c06cdd61d839ee88bcab8089bd5690610004a986f867
font_02_sfnt_off00012242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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