Malicious PDF — malware analysis report

Static analysis result for SHA-256 af97728a4440ecb8…

MALICIOUS

PDF

76.7 KB Created: 2021-03-01 17:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b56a712fe9f6cd535c51da15fc06e01c SHA-1: 32336b67e1ad997044240d7ef14a183d27da375d SHA-256: af97728a4440ecb8ff351fd19d1a8bd623d20703d2c2f9443707ee0e5cf30d4d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous external links, with one prominent URL pointing to 'vilenefex.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to reference product details, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://vilenefex.ru/123?utm_term=polaroid+onestep+flash+600+instant+camera PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457847/normal_601af528d0efa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491686/normal_6028a62a63c01.pdfIn PDF document text
    • https://lemuvizavo.weebly.com/uploads/1/3/2/6/132682731/fasudusalutoto.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/cidlhjb/sky_convention_center_events_pittsburgh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_602c63606f504.pdfIn PDF document text
    • https://zajawegunane.weebly.com/uploads/1/3/4/3/134332092/rolesakaxis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494166/normal_5ff897d9e0c9d.pdfIn PDF document text
    • https://kokujilu.weebly.com/uploads/1/3/1/4/131453241/wenujiwupefuwemaxuv.pdfIn PDF document text
    • https://figuzejigof.weebly.com/uploads/1/3/4/6/134644002/8817b45333.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/jcjihyj/81538271868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_602e06f5b1b50.pdfIn PDF document text
    • https://cdn.sqhk.co/tabakotodi/gfcQyie/53577433236.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477373/normal_5ff5047a1aeb1.pdfIn PDF document text
    • https://saxotatabaf.weebly.com/uploads/1/3/4/3/134328870/kuxixiri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494889/normal_5ffcc36f334e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezixus.myartsonline.com/21355071510.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/63597981925.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/boviloseduma.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/wizutiduvemalido.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/how_to_find_the_ip_address_on_a_lexmark_printer.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_off0000ee49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 5692 bytes
SHA-256: 8078aa3e9a1a2be6224c203c72d77264a8e91089fc9c043854436aac4ce25352
font_01_sfnt_off00010180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 10596 bytes
SHA-256: 233703ca6fdb741c1d8f6cb106c3aabcc221fb332c5579c596a132d8fd258384

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