Malicious PDF — malware analysis report

Static analysis result for SHA-256 af16275100fcf6ce…

MALICIOUS

PDF

66.6 KB Created: 2021-01-10 06:38:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4531c3cea242c03344945abdf76a3cd7 SHA-1: 9623a0619248029d8013529821d1a72dc84929f4 SHA-256: af16275100fcf6ce88187ba1aa9944143f2ef02d1e1a75f996d27542ca94d3fc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded links point to various PDF files on disposable hosting, suggesting an attempt to obscure the true malicious destination or to manipulate search engine results.

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
  • 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://trafftec.ru/123?utm_term=ray+ban+5169+havana+green PDF link annotation
    • https://site-1177689.mozfiles.com/files/1177689/ludo_live_online.pdfIn PDF document text
    • https://site-1179590.mozfiles.com/files/1179590/91902800518.pdfIn PDF document text
    • https://cdn.sqhk.co/rokabumake/6jjhhCM/rekalejufidiniso.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/3215915.pdfIn PDF document text
    • https://site-1168272.mozfiles.com/files/1168272/how_to_bake_spaghetti_squash_seeds.pdfIn PDF document text
    • https://site-1214984.mozfiles.com/files/1214984/geometric_sequence_finding_nth_term_worksheet.pdfIn PDF document text
    • https://site-1166687.mozfiles.com/files/1166687/european_luxury_cars_2.pdfIn PDF document text
    • https://jokazetesolibut.weebly.com/uploads/1/3/5/3/135314514/699234.pdfIn PDF document text
    • https://pokotozumunas.weebly.com/uploads/1/3/1/4/131453498/a1bff9141e.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/wixijowamen.pdfIn PDF document text
    • https://site-1171585.mozfiles.com/files/1171585/hopper_window_screen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_5fbfee0d028d9.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/hehhESr/ear_infection_symptoms_babies.pdfIn PDF document text
    • https://site-1176145.mozfiles.com/files/1176145/burrito_bison_launcha_libre_wikipedia.pdfIn PDF document text
    • https://xapovakugad.weebly.com/uploads/1/3/5/3/135393008/rokeb-paguwopa.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_off0000c537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC537 5532 bytes
SHA-256: 3ad9f60104112b30d31e35a90a61f0ea8a5e6839b68e69fbfcffcfe6bac34365
font_01_sfnt_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 11064 bytes
SHA-256: e5b4b0f09bcb0e38f5e473a2510f65f83d560fa276d7431dc75c794bcabd3609

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