Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a7c21fa86215c3…

MALICIOUS

PDF

73.8 KB Created: 2021-02-22 15:07:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: db5098738835c5938ec88d6267501a33 SHA-1: a8f08f86faca2a50706d468cd20953d5f37d50d0 SHA-256: a2a7c21fa86215c32b8c84674b183ce30517c01fd65f8e901a27f4d30e354fd0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to disposable hosting domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=a+voyage+long+and+strange+pdf PDF link annotation
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/xujow.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/7460511.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367296/normal_6003a83557f10.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/DAhegdN/business_analysis_and_valuation_course_outline.pdfIn PDF document text
    • https://tofabefanij.weebly.com/uploads/1/3/4/7/134726630/2233787.pdfIn PDF document text
    • https://wutotopuwa.weebly.com/uploads/1/3/4/4/134464713/pivubaleviwi-wixazima-pabaximuzuvun.pdfIn PDF document text
    • https://pukokisawar.weebly.com/uploads/1/3/4/7/134749025/bowitasajipogapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_6021c9ba46f3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fda5dda4352e.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/MjdpqCN/uni_for_2_players.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/cmxEhfH/fitaro.pdfIn PDF document text
    • https://cdn.sqhk.co/gupimupiset/ieiaWhi/grand_vegas_mafia_crime_mod_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zonipajabanarun.rf.gd/20907147380.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 5360 bytes
SHA-256: b3fad160eedb9fb6329105d370f8f40f687688ba8b74aae08a1981e902a31405
font_01_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 10156 bytes
SHA-256: 675b1fdb5871b5037f65361359def43089b961ede9a18461d5340c69150af8da

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