Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c0b7faf9efd4b9…

MALICIOUS

PDF

71.4 KB Created: 2020-12-19 04:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6f55ef22bc424da998858a6159edb55d SHA-1: 011882c83cbabb01cf2fc7f1f806a6c3981d84cd SHA-256: f9c0b7faf9efd4b9331a0c1a0f17f957dd41f95b7fddaa804daae8dc2cee2549
244 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a link farm, with numerous external PDF links hosted on disposable domains. The ML classifier also strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. These factors suggest the primary purpose is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=cfa+first+100 In PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/9441484.pdfIn PDF document text
    • https://taxufizewafodo.weebly.com/uploads/1/3/4/4/134477277/2682597.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/wepelisujuxud.pdfIn PDF document text
    • https://xaziribubeka.weebly.com/uploads/1/3/4/3/134397614/piluwow.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/xosawoxejupana.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/damerirazib/54427544489.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd2afa6394b41d6424bc80/t/5fdd5f920f6c913d44d8b561/1608343444043/43059991780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0662013f-6742-472d-95ae-176769d6c61b/rilutaf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc114788ef7301f8b11b9bb/t/5fc309b84f983757204395db/1606617530018/quadratic_equations_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba519cf-6308-450a-abdf-46ef4df4f0fa/dont_starve_together_skins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d60840ea-37e6-4415-aa4a-4a3c90149317/car_eats_car_2_deluxe_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/26247454890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf190fb6-eb63-4ad0-bd6f-3dc2a6c02297/how_do_you_answer_como_eres.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9754203-c22e-4190-861a-3330222073d9/15_gallon_sprayer_parts.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_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 4828 bytes
SHA-256: 066b179a9c8493175684410cf91645c437dec3e577a6828190f163edd44749bf
font_01_sfnt_off0000eaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF9 11148 bytes
SHA-256: fdc2dde103b3dca5a8162c8b9e25776bc091777896c4e30a2e195e3ed1a121e3

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