Malicious PDF — malware analysis report

Static analysis result for SHA-256 5898e317029ee81a…

MALICIOUS

PDF

77.2 KB Created: 2021-04-12 21:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6396a1fd037623a7803166b6eb3959ee SHA-1: 901e642b782f26f0a071a175b10e67c68d0ec82f SHA-256: 5898e317029ee81affb743ac47b059ca63d777839298c7c5e61df524f13d169f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain ('fokemale.ru') that is likely used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

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://fokemale.ru/strik?utm_term=washington+dc+weather+forecast+hourly PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410222/normal_5ffe532723eac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5ffa35998d75f.pdfIn PDF document text
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/5706385.pdfIn PDF document text
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/573ebbcdb8a3.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/watajive/24680086051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73884534-7376-4e2c-96b8-c26311f4427e/65734615887.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/appium_studio_for_eclipse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce982a2-4f83-4a28-b8a7-7f70c5cdcbfa/38489433206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3899732c-a89b-4f91-a126-6db9773f38d4/rubanevukuxoloxoj.pdfIn PDF document text
    • http://duponinet.epizy.com/wilonukapomoxumazu.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/fasipijawowoleguxopipu.pdfIn PDF document text
    • http://famuruvif.epizy.com/sobig.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/76882626239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d91256a9-432e-414d-9242-ed53b5171309/gewixifotiloletano.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/france_vs_belgium_line_up_formation.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_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 5488 bytes
SHA-256: d1b1d07b6a581cb49d65ea8dc17acb5ddef7ad52802792ce8ebd1a31ffc465f9
font_01_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 11692 bytes
SHA-256: 324f2c47ec39f147161d053a1ed7a5343783c1b4f3646e3dea640bd1f0c65e7e

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