Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b28fe80d4fddb71…

MALICIOUS

PDF

77.5 KB Created: 2021-03-01 20:06:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 25d695c2a4a09fcd0f6c28f15fef27b0 SHA-1: 78468de1a6bb0e597997981fa2cdbaea1b4be3ce SHA-256: 1b28fe80d4fddb719dc5848ec19274cf65268c2e7dcafb2524b8c2148a4395b8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

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://midufefew.ru/strik?utm_term=describe+the+adaptive+features+of+hydrophytes PDF link annotation
    • https://kavakisin.weebly.com/uploads/1/3/0/9/130969045/wunekudowiviwokaz.pdfIn PDF document text
    • https://rapalavosifezo.weebly.com/uploads/1/3/4/8/134886177/mojoxepalin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470532/normal_5fe002421d303.pdfIn PDF document text
    • http://lozavisimas.22web.org/awesome_band_mp3_download.pdfIn PDF document text
    • http://stopnutristrike.ru/functional_training_programwm6ru.pdfIn PDF document text
    • https://femidizori.weebly.com/uploads/1/3/4/6/134684525/8503223.pdfIn PDF document text
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/lewofojivujukif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418166/normal_5fc679abb9344.pdfIn PDF document text
    • https://pulimogub.weebly.com/uploads/1/3/4/3/134312020/e41600deeb7.pdfIn PDF document text
    • http://yarrebitteh.online/buy_slot_machines_near_mewdfa6.pdfIn PDF document text
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/jofumezuwijoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_601bac6e5afce.pdfIn PDF document text
    • http://italylife.pro/4956431383075nd5.pdfIn PDF document text
    • http://klokisik.space/sewuvinamewatazikanowe3ukp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476446/normal_5ff0a4a5f1637.pdfIn PDF document text
    • http://antonio-ita.space/simple_room_rental_agreement_template_word_doctieb5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/83570875016.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/13_reasons_why_season_4_release_date_uk.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_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 5512 bytes
SHA-256: 9a70d9d83764ac351302476ebc0422167146c95eb62ea5a430c1287312293026
font_01_sfnt_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 10580 bytes
SHA-256: 879a6e7d82a12eb66d0149b9c8f292bc809884019c53a0d91e58030eb51328ef

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