Malicious PDF — malware analysis report

Static analysis result for SHA-256 105c41534c640439…

MALICIOUS

PDF

73.6 KB Created: 2021-01-12 00:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 188ac8acd8f532a974f757232cd03b3e SHA-1: 720184325faea51475a5642a16729075b980323a SHA-256: 105c41534c64043972e6ec8c114df8c01d9d70a734ed90bde899760a22be1f39
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/aws?utm_term=bt+wifi+app In PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_5fbe89b094c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462992/normal_5fd91d5cc24db.pdfIn PDF document text
    • https://cdn.sqhk.co/kinifukix/axgfiak/xoxures.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530429/normal_5fe9645ef414d.pdfIn PDF document text
    • https://site-1168108.mozfiles.com/files/1168108/43407196621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_5f9523e9a42d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_5f8c58f6d832f.pdfIn PDF document text
    • https://site-1174819.mozfiles.com/files/1174819/nufuvuxogeto.pdfIn PDF document text
    • https://jakuxilo.weebly.com/uploads/1/3/4/7/134711712/778642.pdfIn PDF document text
    • https://rumitubo.weebly.com/uploads/1/3/4/5/134525427/balabawatat-minipezifevepar-dinati.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/LgfQhLf/lebubuwuse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476147/normal_5fc44d3178e57.pdfIn PDF document text
    • https://site-1174730.mozfiles.com/files/1174730/blow_my_mind_apple_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_5fb3cb9eda539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472198/normal_5fa4327a7c214.pdfIn PDF document text
    • https://site-1173608.mozfiles.com/files/1173608/arcade_ball_machine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464541/normal_5fa42dffab44c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_5fe9d3e144173.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 4184 bytes
SHA-256: 3afe19f567290144d7efccf8f9aceb99fff07e050c3c6d49626ef312805a85bf
font_01_sfnt_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 11268 bytes
SHA-256: 16b7075b268059d60a9351587f1bb762736c94a577fdc93bfa73263ea207623a
font_02_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378