Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f297e70aa74c56…

MALICIOUS

PDF

64.4 KB Created: 2021-03-02 03:26:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 43e9f3fa6bfe3779577f97bff27f924a SHA-1: 1c6df9c3b9e93a618f5aba649a74dcdd07e3bf79 SHA-256: c3f297e70aa74c565a1ab4055deeee077a8300862b0ebaec46fbc6ebc2886906
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector and a link farm. It contains numerous embedded URLs pointing to external sites, some of which are hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=la+republica+de+platon+editorial+eudeba+pdf In PDF document text
    • https://vupebuxotilejo.weebly.com/uploads/1/3/0/8/130814562/9823777.pdfIn PDF document text
    • http://lightly.store/662594749970hhfd.pdfIn PDF document text
    • http://vir-tus.com/nimupuzoburelovepitudike7r9jk.pdfIn PDF document text
    • http://sevastopol.sale/6284377745rxrrf.pdfIn PDF document text
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/8e87f2ef1.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/ajjzhcf/video_meme_creator_app_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/ibKhdji/best_free_voice_changing_programs.pdfIn PDF document text
    • http://lishop.site/dan_brown_the_lost_symbol_audiobook_youtubedrlj8.pdfIn PDF document text
    • http://salet.store/zipokaforobisufugavr2v.pdfIn PDF document text
    • http://fragcups.com/how_to_install_netgear_wireless_n300_usb_adapter_without_cdk465a.pdfIn PDF document text
    • http://dreabling.online/ultimate_fishing_simulator_guide_android76ii8.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/W9XpGT1/panic_pump_steam.pdfIn PDF document text
    • http://goodsfor.life/popevonametapeug4v.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/EhfGggW/retukosezevadop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAD 5052 bytes
SHA-256: 3c32be14d264c3cd9063727858ddfd15a0cc8fbe7acacc94384a71d05376de51
font_01_sfnt_off0000d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 10968 bytes
SHA-256: 1e8e0de8c2a9c0978abf56aa6b60a2008190df28f751e7631ed390ca3a8460db

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