Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d7a1709f34fb0e…

MALICIOUS

PDF

84.5 KB Created: 2021-02-26 06:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fb6e585c1b12b4b98c885276f4cb48cb SHA-1: eda0cc8b1188335ba883c9bd33584f34d0cd76a3 SHA-256: f0d7a1709f34fb0ef6d5e663066890771dd72af0d2ed311f5abf826f4f01897b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or a distribution point for malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, indicating a tactic to obscure the true destination or spread malicious content across disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=azteca+gary+jennings+resumen+pdf PDF link annotation
    • https://tositoda.weebly.com/uploads/1/3/5/3/135312816/8a69f4e0ea81.pdfIn PDF document text
    • https://nanuleseja.weebly.com/uploads/1/3/4/0/134012971/9869258.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460066/normal_6007302329e1a.pdfIn PDF document text
    • http://moreprodukti.com/matshita_cd_rom_drivers_freem50vy.pdfIn PDF document text
    • http://dkmz1.club/miller_bobcat_225_welder_generator_manualhxsxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_600fd573c7100.pdfIn PDF document text
    • https://momobamuv.weebly.com/uploads/1/3/2/3/132302987/281b8f58b.pdfIn PDF document text
    • http://poradoit2.site/bozejatizonekepubonapduis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_600b6f716635c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_60376025cf72b.pdfIn PDF document text
    • https://katesagi.weebly.com/uploads/1/3/4/8/134864962/vinizaviniliro_guxirutesi.pdfIn PDF document text
    • http://virnet77.ru/formal_dinner_attire_dress_codepv6m5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruvatarojamun.rf.gd/fawowibagovunudiboxupa.pdfIn PDF document text
    • http://zuboxevu.epizy.com/68330095805.pdfIn PDF document text
    • http://josegofubusem.epizy.com/statistical_data_types.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/85099840247.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_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 5660 bytes
SHA-256: a629beaf2cf1494c188c1c3c99afdfbb053a56574dd355ea6be948f6df74adb5
font_01_sfnt_off000122c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 10000 bytes
SHA-256: e91c225246eb8833b89821f32c2823a73482000a8c277244a8b5b583fd5e6d23

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