Malicious PDF — malware analysis report

Static analysis result for SHA-256 3171fde1b52d176f…

MALICIOUS

PDF

76.5 KB Created: 2021-02-22 20:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4d46202abdcf75f34005e6025dd98882 SHA-1: 2090c97971b2b0450bec1a9e6c80f06bbbc40ed9 SHA-256: 3171fde1b52d176fef1d829b828055ac5bdc05c8a62274d8fb69513c9aec86ca
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to a card game, suggesting a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=world+of+disney+eye+found+it+card+game In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_5fd392bc6a47a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_602c99e11164d.pdfIn PDF document text
    • http://zijogodakenanaf.22web.org/productivity_efficiency_and_capacity_utilization.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_600abbb5b9590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5fd1c590d2a74.pdfIn PDF document text
    • http://c-advance.space/8228492175viho8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_6017714967522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5fd79cd17b6ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413966/normal_5ffc7f7b5d7bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403822/normal_5fd11c9472676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_602e600639ee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_60290be6eb414.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zafurug.epizy.com/dunesafivevigiw.pdfIn PDF document text
    • http://dezologukow.rf.gd/segment_and_angle_bisector_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/bronfenbrenner_theory_in_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/meme_generator_for_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/21713340297.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/6839224435.pdfIn PDF document text
    • http://vamagirizotaro.rf.gd/half_life_calculations_worksheet_chemistry.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_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 5456 bytes
SHA-256: 08e958a0041c79019935a495cc12e8fe320365df4dc1572d5bc301fbdc33869e
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 10264 bytes
SHA-256: cb1739ce5ec35dbda4c46f13543281e6d5a7f111fc4aad58ed64c3435999108b

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