Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b10ce5ce461a98…

MALICIOUS

PDF

83.7 KB Created: 2021-03-23 07:34:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1a8862b5e372cd53a01bda9ce16ab3e2 SHA-1: 283df715d71d081bb24545f30c867a4ed2f6f8ea SHA-256: f3b10ce5ce461a98a082c80b3be992632ac5553014a9f97066f76d848547da25
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to a refrigerator, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=kenmore+refrigerator+model+253+capacity PDF link annotation
    • https://cdn.sqhk.co/fikalibumi/iiijc4A/nowipexova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_6018c8a125f9d.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/jaieMGs/77238068194.pdfIn PDF document text
    • http://milansit.space/futatawudetixej825i.pdfIn PDF document text
    • http://milesnires.xyz/26136067806v00l3.pdfIn PDF document text
    • http://detonic-de.website/20914481690e1917.pdfIn PDF document text
    • http://govnosiakxws.online/icd_11_complex_ptsdaksas.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/ji1WifN/shelter_2007_full_movie_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369334/normal_5fc7ec7371d05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_6015dc2d81446.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/LiezGih/nosufanoxolatuzibigilaven.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/ghihljb/kasafutibe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_ec2a383ec37e4b12b83cc3f96f8c1742.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_6f047240a7264e8a978700d872170333.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fifomi/american_safety_and_health_institute_cpr_training.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/discipline_equals_freedom_booktopia.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_b9f68db815da42f19b62c37cadb27236.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_dcfac9db11be47439c3f37412dc015ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/juliwovujamatorugi.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_7c00f8dff5484800a1797ded67af9e39.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_566cd7a2767c44419f1c1c3a0a227123.pdf?index=trueIn 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_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 5788 bytes
SHA-256: ee5aedb256e6116e28be0c3cdab6342d80c1858b79ba964aa40bb454cbaebe0b
font_01_sfnt_off0001183a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183A 12052 bytes
SHA-256: 3ddf208e6c7e6d13a8d8002e28c2460ceaad689e15661618e431a58163b31a71

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