Malicious PDF — malware analysis report

Static analysis result for SHA-256 355c9600baa02515…

MALICIOUS

PDF

82.2 KB Created: 2021-02-25 16:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0641aac62962ab64a79a2ca2441711c5 SHA-1: 23d996e31ff938b89a03c86e4c6dc02847d0484a SHA-256: 355c9600baa025150d3e15249ff96e156d3f9a0eeedc0abcaefd1adc126cc1c7
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs point towards a social engineering attack designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=antenna+tv+guide+henderson+nv In PDF document text
    • http://good-production11.site/frp_bypass_apk_to_sd_carde7snw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478950/normal_60209ad164364.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388062/normal_6008f18ab6e2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_603598d05cf3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451566/normal_600e5972a6208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_602677b008280.pdfIn PDF document text
    • http://requiredjokblog.com/nccn_guidelines_in_oncologyv9mtr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410416/normal_60302c771b694.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472503/normal_5ff015466ea4f.pdfIn PDF document text
    • http://logoped-samara.ru/72493512598ybv9y.pdfIn PDF document text
    • http://moitender.org/kexoxelaxivunuvilqega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485926/normal_601490a12971a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495262/normal_5fe2ac5800db4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480412/normal_6005195fad80c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fccc3447a8fd.pdfIn PDF document text
    • http://mmmuuuue.space/street_fighter_4_apk_all_charactersx8247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427091/normal_6028b82e0abb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413223/normal_5fdcbf1a29260.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/dalava/83166472738.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/55647013547.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/prime_brokerage_agreement_form_151.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_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 5104 bytes
SHA-256: 2f8b0b857cc7a1fb9d31914e2a3bfafb82e2eb74222d083d0d123dae6a1c337a
font_01_sfnt_off000118a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A0 10120 bytes
SHA-256: 497e8a53b85c9a6a196863cb1d6de3f5e4c731b1cc6a1c9d078f6c22052f61e9

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