Malicious PDF — malware analysis report

Static analysis result for SHA-256 91699e5ddd5fd285…

MALICIOUS

PDF

62.5 KB Created: 2020-12-22 04:33:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 169fb33bc073ff85cc62c91121de5a5a SHA-1: 0d923dfcb0ede1ee24f5f02622d59801e504a488 SHA-256: 91699e5ddd5fd2854a2f89aeac22d2a620909688a29f62076fd7a448f4f0f5b5
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded links. Several heuristics indicate it functions as a link farm, with at least one link pointing to known malicious redirector infrastructure. The document's primary purpose appears to be directing users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://cctraff.ru/123?utm_term=berserk+anime+2018 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446512/normal_5fc0d942e8b38.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/tuvolofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_5fdc147937568.pdfIn PDF document text
    • https://wafulerafi.weebly.com/uploads/1/3/4/5/134503758/cc32f83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459318/normal_5fe0985abecda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5fae204267049.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/9320316.pdfIn PDF document text
    • https://wapugumimujera.weebly.com/uploads/1/3/4/7/134749028/xidopodixi_gawodovop_simojisalamela_tubuduxijiwun.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/4347834.pdfIn PDF document text
    • https://fofijibub.weebly.com/uploads/1/3/3/9/133999799/5517600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20a7411-abc1-486d-95de-7ba8cc3e9582/rite_of_infusion_witchery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b44005-1b30-4761-be94-d64086048d30/1003108018.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_off0000b8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DF 5432 bytes
SHA-256: 3e7fcbc4274cc55b23e0b68aa3196989b55aabae67d5ac4e992717cc103b8540
font_01_sfnt_off0000cb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB42 9936 bytes
SHA-256: 75391dcb3cfc9e59102534adba76bb5dff719bc4d8bbf3711cb9cf9ffd7f14e3

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