Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae93382e0aef6adb…

MALICIOUS

PDF

82.8 KB Created: 2021-02-27 10:03:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 28f4ebefed40a73cd95563b4d262fc1e SHA-1: 2988cc99dba2fe739b58942b6cfd164d053e8ea7 SHA-256: ae93382e0aef6adb42782dc934018ae792bb79e07cbbc1e555c80c9f62c62537
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and a deceptive document body suggesting a lure. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/123?utm_term=which+snark+tuner+is+best PDF link annotation
    • http://dorulezebum.sportsontheweb.net/basics_of_biblical_hebrew_vocabulary_cards.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/mepudewekimajufuso.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/mitefoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473445/normal_5fc9b0b22e85f.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/bMjEUic/4414697576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_5fea4527060df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498376/normal_5fcf452ef13c0.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/g6ighep/pocket_knife_sharpener_lowes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377113/normal_60001a3f6abf8.pdfIn PDF document text
    • http://desokore.medianewsonline.com/falanijiwunejotezo.pdfIn PDF document text
    • https://cdn.sqhk.co/semegopo/b33Dhhe/xerokovariwibanuke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jitawidavez.atwebpages.com/31150952217.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/63698878939.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/google_assistant_api_android_example.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 4844 bytes
SHA-256: 5a1f79b628e4aa1ac2fbe5376a51a18d10c5c6ac251599dd62ffb0da33bfadfa
font_01_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 10584 bytes
SHA-256: d30e4cf0ee94c639b0abb6a5e37b19a8d54c88ac90a3850675c697bc25ebde2a
font_02_sfnt_off00012e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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