Malicious PDF — malware analysis report

Static analysis result for SHA-256 e143422362467752…

MALICIOUS

PDF

88.6 KB Created: 2021-03-22 15:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8672d7e1d57ff9766a7938b4400dc1aa SHA-1: 86d1972ce04ebfeadb18cbc18457ecab01752f0e SHA-256: e14342236246775292ee62b1ba65cf9780899149488fea6c012c6bc65e1f983b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure attempting to trick users into downloading applications or visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://ponafet.ru/aws?utm_term=download+hp+15c+scientific+calculator+android+app PDF link annotation
    • http://fotonagosuslugi-01.space/libro_de_educacion_fisica_2_secundaral59w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495387/normal_604d4349855e8.pdfIn PDF document text
    • http://kieverts.xyz/remington_model_33_serial_number_location5x607.pdfIn PDF document text
    • http://ketrovk.xyz/lizasuvoxufz2qhw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_60396eb770d6d.pdfIn PDF document text
    • http://all-host.site/niporelidevojowalijoxaaub.pdfIn PDF document text
    • https://renezotutumiw.weebly.com/uploads/1/3/5/3/135343322/f1e7c19.pdfIn PDF document text
    • http://cookwellbakewell.com/hamilton_beach_flexbrew_2_way_coffee_maker_model_49976_reviews63ad6.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/57214240891d0u1f.pdfIn PDF document text
    • https://penuwepilaxol.weebly.com/uploads/1/3/4/7/134756509/8eaaccb7c579.pdfIn PDF document text
    • http://gk-kuban.ru/berserk_vol_13_coverspgdo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://filazit.epizy.com/95288321854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e49df44-4f7d-4aff-b362-b878d5498c22/what_does_the_term_game_of_chicken_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc315a8-0f08-41e2-8974-b317b54ed315/26548577062.pdfIn PDF document text
    • http://dagajevefud.epizy.com/catalyst_9400_datasheet.pdfIn PDF document text
    • http://zevovalik.epizy.com/geloxosupopodep.pdfIn PDF document text
    • http://malebowepapin.epizy.com/zofumemidowoviburumut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/329128ee-f3e5-49ec-b0b2-28adbdc6f5eb/rigepuxowimozolupuwefaro.pdfIn PDF document text
    • http://gofeneneju.rf.gd/samsung_s4_mini_memory_card_capacity.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_off00011abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 5512 bytes
SHA-256: c7f1b69ea3fc8e8bce3ec32a68efbf675921a53531159369a9d46140a6af14c8
font_01_sfnt_off00012d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D99 11504 bytes
SHA-256: b78812d8c05b830981c204b91d6caf71f1517a3037f96fd728f27ab5b6b516c0

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