Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f1c47e044cf610…

MALICIOUS

PDF

82.1 KB Created: 2020-12-30 00:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9a503e0f88ac206d86fc690cd9586ffc SHA-1: d4a1f1c0a12458996f95d1c70a52e7f17258f37e SHA-256: 16f1c47e044cf61012b5a68f3132884be0122d885604e16dce8835e610848968
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, suggesting it is part of a link farm or SEO poisoning campaign designed to direct users to potentially harmful websites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://traffking.ru/wb?keyword=color%20fill%203d%20mod%20apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_5fabb2b2dc655.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461767/normal_5fdd7f452d5cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5fd635ce40e10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5fe0476866dce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_5f9be3b8ca0d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467979/normal_5fe6545baf5c4.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/06999af4a6187d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_5f8f15b3dc7b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408481/normal_5fc6783930c34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5fa4930311b2a.pdfIn PDF document text
    • https://zavewixesareput.weebly.com/uploads/1/3/4/8/134855174/491398.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8febaa75-f5d7-4245-b2b3-84505ce0b6bc/feliz_navidad_piano_sheet_music_easy_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 4744 bytes
SHA-256: f047cdefbc6fa3cecd42f5e23950f226de19a3d7e0349eac616610db701bca7e
font_01_sfnt_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 14348 bytes
SHA-256: c08b8c36164c30f033223ff5a08096cbd3a8776693e5ac674bdafe24fdf744a9
font_02_sfnt_off00011535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11535 16520 bytes
SHA-256: 73ac38e8513e6dc0ca7b760581fbf47a0559cb684c7800058485289952757042
font_03_sfnt_off00012bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF6 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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