Malicious PDF — malware analysis report

Static analysis result for SHA-256 6159377a6961899e…

MALICIOUS

PDF

71.0 KB Created: 2020-11-24 07:59:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8e96fd7a027411bf0c5bbfe15c69adae SHA-1: bf5218c6a4883876de72c6c9e68496c769b86836 SHA-256: 6159377a6961899e21eecd74a6053c47d2d041ee2a911c5fdc22fdf1cc950758
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as 'https://trafffe.ru/strik?utm_term=latent+memories+destiny+2', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://trafffe.ru/strik?utm_term=latent+memories+destiny+2 PDF link annotation
    • https://bivojivowuru.weebly.com/uploads/1/3/4/7/134726538/sutumuteju.pdfIn PDF document text
    • https://lisamotakix.weebly.com/uploads/1/3/4/3/134308999/nududuratap.pdfIn PDF document text
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/d091bc71a4ead2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410989/normal_5fbba6289d03f.pdfIn PDF document text
    • https://sidujojuwizubal.weebly.com/uploads/1/3/4/5/134587716/jiwibefujow_jezezefinufet.pdfIn PDF document text
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/e944813a1b5c.pdfIn PDF document text
    • https://dawerofe.weebly.com/uploads/1/3/4/3/134361643/zulanapik-fatadijep-bemunogim-lekasenixan.pdfIn PDF document text
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/wutel-losumimusuk.pdfIn PDF document text
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/0a172f08b313.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/jadudusujuje/jurnal_agroteknologi_unej.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/cadillacs_and_dinosaurs_rpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d1eb35-1bad-48ed-9506-afd8c0f68634/29800577285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eebe4e9-2e63-4626-ad56-0e794a9528a5/how_to_make_a_crossbow_in_minecraft_java.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fabd69e-b208-4967-8b64-ff3ad5cc0c59/xem_phim_high_school_musical_3_viets.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_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 5112 bytes
SHA-256: 47958081b6df319c9200e4dd2e01a8d7a205ef3ccdbdd5c34f7feb6973330563
font_01_sfnt_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 10620 bytes
SHA-256: d9931db511e19a66649bea0c0341c571076d99a533d7080115cf0253dbb39711

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