Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e8d6e1a6d09df9…

MALICIOUS

PDF

75.8 KB Created: 2021-02-20 04:16:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: decc75f02d90b2a50dc2960c0371daca SHA-1: 35db77e7c2fa2b5285fac980ad26b439feb7f1fc SHA-256: f2e8d6e1a6d09df9d66863c84154ea91e7e7dfa9207ed845b2999767dbca3df1
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and flagged as link farms. One high-severity heuristic specifically identified a PDF link to an algorithmically-generated URL, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=west+bend+stir+crazy+corn+popper+manual PDF link annotation
    • http://chuvashovfamily.ru/gutog9apzo.pdfIn PDF document text
    • http://cardioactiveuficiale.site/juwufatix2mfp.pdfIn PDF document text
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/woruvujasez.pdfIn PDF document text
    • http://drnextact.xyz/44825946909e97x7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_602d73040a2b6.pdfIn PDF document text
    • http://load-bcp.com/nanetuwucrx8.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/wafasitowazupu2ubt3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500446/normal_5fe2132d1aa67.pdfIn PDF document text
    • https://minizejemeroro.weebly.com/uploads/1/3/2/7/132740725/989539.pdfIn PDF document text
    • https://riwetomawojok.weebly.com/uploads/1/3/4/5/134516188/puvidafulam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366623/normal_60018cda0f785.pdfIn PDF document text
    • https://famalekirujapa.weebly.com/uploads/1/3/1/4/131453917/xivusanidisunom.pdfIn PDF document text
    • http://goodshopsales.xyz/sapoxedivimobamipiver2ea9n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_5fe81f396c16f.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/bejeseja/99604397342.pdfIn PDF document text
    • http://taludoxatimepup.rf.gd/84003743526.pdfIn PDF document text
    • http://geduzesibasax.epizy.com/feruzikusazakuzetuta.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/wonixumado.pdfIn PDF document text
    • http://kagiweluxipo.epizy.com/vewofemalifularuvi.pdfIn PDF document text
    • http://fikamax.epizy.com/gitabelivenagedasedir.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_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 5524 bytes
SHA-256: c4b9cd4ba41594a7ac7866ed6bb6544dbec1d201669cc410af362aa6a8294d5a
font_01_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 14592 bytes
SHA-256: ddecd74beba75976009fcf889f8e2662d65adf4e01b01d13c54aeaf67d0e2dc2

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