Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09078c243652437…

MALICIOUS

PDF

92.7 KB Created: 2021-05-22 05:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 352074cd66861fd14a5a56660df82773 SHA-1: b4cc7cc386c67db2a4b49887995532963849dc66 SHA-256: e09078c243652437918fe01c91de43432b12e420eeb79800451e7e1a7aa3a466
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or distribution network. The primary malicious URL identified is https://fokemale.ru/strik. The document body is heavily obfuscated and appears to be a lure for literary analysis, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/strik?utm_term=an%25C3%25A1lisis+literario+de+la+obra+el+caballero+dela+armadura+oxidada PDF link annotation
    • https://wizisenax.weebly.com/uploads/1/3/4/3/134320615/dotinoxixaxoz_sepezibitolona_bifojudesekil_vugow.pdfIn PDF document text
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/8398087.pdfIn PDF document text
    • https://zimosamizafokox.weebly.com/uploads/1/3/6/0/136091721/kikixokukegovefuk.pdfIn PDF document text
    • https://binewetakug.weebly.com/uploads/1/3/5/3/135326509/vulidaxidepevidiro.pdfIn PDF document text
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/607e32ee068bd.pdfIn PDF document text
    • https://vusugurubem.weebly.com/uploads/1/3/0/9/130969976/vugowifapafuxeb.pdfIn PDF document text
    • https://sulogifobib.weebly.com/uploads/1/3/5/3/135322722/2339617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469634/normal_605720a111a88.pdfIn PDF document text
    • https://nevofegef.weebly.com/uploads/1/3/4/8/134851200/mevosusi-xafakamopa.pdfIn PDF document text
    • https://zipatusuf.weebly.com/uploads/1/3/4/0/134012633/9409395.pdfIn PDF document text
    • https://wilibupa.weebly.com/uploads/1/3/2/6/132681560/8523830.pdfIn PDF document text
    • https://lifinupal.weebly.com/uploads/1/3/5/3/135336288/f5811187.pdfIn PDF document text
    • https://dumuwikodopod.weebly.com/uploads/1/3/4/4/134458554/fumut_lowurudosupenod.pdfIn PDF document text
    • https://kawawipebezuvo.weebly.com/uploads/1/3/1/4/131409621/risuwudogajomi_lobukojapiwu.pdfIn PDF document text
    • https://kemipopebu.weebly.com/uploads/1/3/4/5/134585234/waxupadebogesom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_60637f6a6a5d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c533beb3-01a9-4e2c-9747-c491e6529e73/1_cal__kcal__cal.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/gubitek.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/26598397503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/315635d9-70ad-4ffe-bbe4-75b9650a9d1a/megagujekapowupodubelowus.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/a4_letter_templates_to_print.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/072e1c79-8585-490e-af13-956abbde8224/10049504170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15e85bf0-0212-4358-9fd5-8a9a2ec61cf7/69220482596.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/foxolisetepilikexikow.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/fokivugero.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_off00012909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12909 5516 bytes
SHA-256: 7b699d7a952f222ed6309bae0b1c06b167be2993951682786bb99982064968fe
font_01_sfnt_off00013b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B27 12052 bytes
SHA-256: 1069f20b6ea23f808b320fa1ff11ac78fee3cb847f51f252d031f31c965d27e6

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