Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f19a94bcc04b6b0…

MALICIOUS

PDF

63.2 KB Created: 2020-11-29 20:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 17e33625742d41c73e43138edb9380ce SHA-1: dd55dce6b0e54c793d91dcfa961fa5b677cbad67 SHA-256: 8f19a94bcc04b6b0ff88a64a9be5976a5540c3ffedf21fdab92295a67d8f750f
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external URLs points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=intermix+madison+ave+new+york PDF link annotation
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/mejezerazibubi_jimarofum.pdfIn PDF document text
    • https://furevevesegino.weebly.com/uploads/1/3/4/6/134653878/vuwakamodelufafesuk.pdfIn PDF document text
    • https://telozigigozato.weebly.com/uploads/1/3/4/3/134310186/1117764.pdfIn PDF document text
    • https://vigofamuzozovi.weebly.com/uploads/1/3/4/6/134671609/633972.pdfIn PDF document text
    • https://mawijazug.weebly.com/uploads/1/3/1/3/131380733/pubusel.pdfIn PDF document text
    • https://kekulewu.weebly.com/uploads/1/3/4/3/134398637/venex.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/4484544.pdfIn PDF document text
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/zufilezofimavip-nasubirefib.pdfIn PDF document text
    • https://tujigagozevako.weebly.com/uploads/1/3/4/2/134266307/fufesidekano-lolafu.pdfIn PDF document text
    • https://wokewimafagi.weebly.com/uploads/1/3/4/5/134598023/migufaziko-bejepe.pdfIn PDF document text
    • https://zatazonikafude.weebly.com/uploads/1/3/4/3/134340422/dikizumepuv-ginexalinusaz.pdfIn PDF document text
    • https://zawupudoj.weebly.com/uploads/1/3/4/7/134726705/jiwupere-jesatawanurobet.pdfIn PDF document text
    • https://gebulofafilo.weebly.com/uploads/1/3/4/7/134717894/jikeboti_nebidowusipaz_gajigoxarojabe.pdfIn PDF document text
    • https://duzuvopewawufos.weebly.com/uploads/1/3/4/4/134491429/38864f65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD7 5264 bytes
SHA-256: 65ca10714047ce5aaaa6e16ff5fc3ac7abe7107435d18d75fccd6472f5e94e2b
font_01_sfnt_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 10408 bytes
SHA-256: 58473102386d393ad0f32ec7fd7ef18f566ab7a23af5ac0d65b369f49b1b80fc

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