Malicious PDF — malware analysis report

Static analysis result for SHA-256 321a0f300611c39e…

MALICIOUS

PDF

82.8 KB Created: 2021-02-14 01:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 038621e2d5e4ba41adcb8d7c9bec0847 SHA-1: b466c3a45e1eafbd6d99d9fd7e996796791e430d SHA-256: 321a0f300611c39e50f0c57efd066dae2bbc0f110f070621d2903cc2476c7597
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm hosted on disposable infrastructure. The ML classifier and ClamAV also flagged this file as malicious. While no scripts were directly extracted, the nature of the embedded links suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
  • 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://yafferge.ru/wix?keyword=fnaf+4+survival+guide In PDF document text
    • https://nolizusumebixaz.weebly.com/uploads/1/3/1/4/131438071/bikeki_janevisifidaku.pdfIn PDF document text
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/191768.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/qjcEAhf/music_equalizer_software_for_pc_free.pdfIn PDF document text
    • http://grinallex.shop/80855267420tkous.pdfIn PDF document text
    • http://zelopaqq.xyz/audited_balance_sheet_2019_due_dateg74zx.pdfIn PDF document text
    • http://wersita.space/auntie_hammy_pew_pew_pew_mp3_song_downloadmkq4h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5fd14d8962baf.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/ehiJUji/tiduzewa.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/viziwiripozokawalika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370263/normal_5fc5e6f83656c.pdfIn PDF document text
    • http://freshka.fun/backend_template_yii2tddam.pdfIn PDF document text
    • http://huseyincanx.com/174435747072uotn.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/rizijubovapuk/beehive_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/narukoxute.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_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 5176 bytes
SHA-256: 0fe6472bb39268fe14a217f13de867db8201c14dc8255ca08c9af8277df8c87b
font_01_sfnt_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 10720 bytes
SHA-256: 5b398bdf3cf91b003f10365263e2067891e0cd21479c083f17d8c64fe9130e51

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