Malicious PDF — malware analysis report

Static analysis result for SHA-256 a490f66919c04af9…

MALICIOUS

PDF

77.4 KB Created: 2021-02-17 12:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b75d4783b4fbd64bf8fc457794d5257c SHA-1: ed2e6a385c41504b2c3a9417f7d83bcbfbbfa7bc SHA-256: a490f66919c04af9aa72c90ce006a3007057fc3b84a5852ed3828e226ee07066
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL suggests a lure related to 'Walking dead vol 22 pdf', indicating a likely SEO spam or phishing attempt. ClamAV also detected this file as Pdf.Phishing.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://druttle.ru/wix?keyword=walking+dead+vol+22+pdf PDF link annotation
    • http://zuwaweno.iblogger.org/5377265506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_600fd39b461bd.pdfIn PDF document text
    • http://fikofeva.22web.org/geometry_chapter_4_triangle_congruence_proofs_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426541/normal_602c5acb84105.pdfIn PDF document text
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/7582121.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377706/normal_5fff28f665cff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_6010434da5158.pdfIn PDF document text
    • https://katidifivova.weebly.com/uploads/1/3/4/7/134715674/959858211645f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_6004c31605a39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464996/normal_5fe24a946fdd2.pdfIn PDF document text
    • https://zubikuzo.weebly.com/uploads/1/3/1/4/131453486/14899f5769d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_6019d4c27b1c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420588/normal_5ff45191eda16.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/jedadokuti/hotel_transylvania_cartoon_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/insomnium_winter_s_gate.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/ieee_transactions_on_industrial_informatics_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/gotidiloso.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/84935986508.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_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 5204 bytes
SHA-256: 558dae8d2dfaf82615e4053236befa82ab297360d172e7dd9527ca1b9ac151b1
font_01_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 10504 bytes
SHA-256: 0bfa5b91dc7522985ccb2caf9ef99e51009ae7a02073cf9d05e5231baf0462b2

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