Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f634a79b4abe24…

MALICIOUS

PDF

66.3 KB Created: 2020-12-19 19:36:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 49da924d42de395a1fa348af840f101a SHA-1: 7512320010354bb8f6ec93442c04a62b33bf0e87 SHA-256: f4f634a79b4abe24d7e47a99b7d870e33d0c28c1468b7b3c6ad89396c2e000dd
174 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/strik?utm_term=download+shareit+apk+for+pc'. This URL is likely used to redirect users to a malicious site for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious, and ClamAV detected it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains text related to downloading software, further supporting a lure-based attack pattern.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://traffmen.ru/strik?utm_term=download+shareit+apk+for+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_5fdb5a9b343ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490524/normal_5fc55f406edd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5fa9b2b232fac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374369/normal_5fc39c95e14bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417525/normal_5fa9b4c455a50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_5fc0f638e3eb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_5f9ffe3ed37e5.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/zumuxojezudag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_5fb9294004667.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/7727f951-60ae-4c1d-b91d-3a711b3d73e3/dog_cage_sizes_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b55200-d634-416a-a405-eee980805382/fulakatininibekef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc2e256-2ac7-4e52-837c-a00ebedc8544/ejercicios_areas_y_perimetros_6_primaria_anaya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff52f1c-ac68-4d36-ab1d-0a9b5cf7481c/president_on_the_dime_crossword.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef302c4-904a-4677-a8f2-df0178f03cf7/square_numbers_worksheet.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_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 5396 bytes
SHA-256: 1b0e1898ff070ea78ff23ef2ddc45a2de4ad96bbf4a61d6550ddaf8411ed18f9
font_01_sfnt_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 9596 bytes
SHA-256: f1b66a3b8be49b7a8832730a09797d15cd7ec03cf42f8c61371f60c3581c66a1

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