Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad37ee3c62ce5af6…

MALICIOUS

PDF

69.0 KB Created: 2021-02-27 21:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b3d0c875e7d0b9aa66ec2f0ef42b7f02 SHA-1: 7d203700ea3b71d86d0b7867a920bd8c1ed0a618 SHA-256: ad37ee3c62ce5af6b9a8850a5c8a1f23e74a8c650f89d4c993d1139d9f0045ca
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan threat. The embedded URLs suggest an attempt to redirect users to potentially malicious sites, possibly for further exploitation or credential harvesting.

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/award?keyword=we+are+going+on+a+bear+hunt+book+cover PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450638/normal_6013e0647580e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5ff394266aa0f.pdfIn PDF document text
    • https://bijariruxo.weebly.com/uploads/1/3/1/3/131382387/polubiporivevubavef.pdfIn PDF document text
    • http://icily.xyz/2981893797v9u67.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/ninitipizobakerazawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421983/normal_5fe0057da3703.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422134/normal_5ff023a3ad930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459625/normal_5fe92d809ab62.pdfIn PDF document text
    • http://cozyplacefor.rest/autocad_keyboard_commands_changext7et.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_60216f97e6753.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401976/normal_5fe0987577e58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446377/normal_5fedca096c745.pdfIn PDF document text
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/figifozovazalov-futulavum-luvif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fca7d9eecf6b.pdfIn PDF document text
    • http://sesalon.xyz/chrisette_michele_songs_freekcv4x.pdfIn PDF document text
    • http://stroy-level.ru/84975499420bay2.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/xedewofuretujo/android_recyclerview_tutorialspoint.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/colostomy_diet_nutrition_care_manual.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_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 5128 bytes
SHA-256: 68be5b860b2290884b93a208f889ee35280c37a5253a8ec871806513d69e954f
font_01_sfnt_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 10304 bytes
SHA-256: fe9815e96594477b91b51c802f9450dd89f718224bce580c5a629431f53af710

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