Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b8cdf61d1f12c8…

MALICIOUS

PDF

79.1 KB Created: 2021-02-27 00:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cf3a0cccee843f61b35fe1c1cb04f83e SHA-1: d0aba174a1a0acfcdafc2e039759eee0c359c6b9 SHA-256: 24b8cdf61d1f12c8e2569d7aaab8a123c7ee1d8117ede55575aa094af77bb23d
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 external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to potentially harmful websites.

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://xezojetit.ru/aws?utm_term=whirlpool+d45+water+cooler+parts PDF link annotation
    • http://mebel-albero.ru/articles_contracts_fle1wt75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416304/normal_603973a06d26a.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/fry_sight_words_first_100.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/zhegeja/download_true_football_manager_mod_apk.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/36711054467.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387419/normal_6009652dd77ae.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/54746274149.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/ecTgjif/83060792465.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/ghgdhjg/94686227459.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://xomapagovujux.atwebpages.com/gedapisotule.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/enoxaparin_davis_drug_guide.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_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 5160 bytes
SHA-256: f081684407ec52d4f35554ce91414e52dabd2e462a05bb049f1e6222f3a8f07b
font_01_sfnt_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 11068 bytes
SHA-256: 792b90cc56344e39a83d863dfc3efcd980e8c27c590cc25747daffae22df00af
font_02_sfnt_off000121df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DF 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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