Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc16b3774358c799…

MALICIOUS

PDF

57.6 KB Created: 2020-12-04 21:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 554b213b4f3636aea162460d04f1e89e SHA-1: 61b6ae0ec8510e4cef195a10b74578a6dec57c41 SHA-256: bc16b3774358c7994ad5fd4704d3e86f0df5d49bb879f18c342d1a9745e2b2f2
242 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm likely used for SEO manipulation or to distribute further malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, aligning with the ClamAV detection of Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://gettraff.ru/strik?utm_term=bruce+lee+my+brother+full+movie+in+hindi
    • https://cdn-cms.f-static.net/uploads/4450502/normal_5fa6a77f571f6.pdf
    • https://wilulanokubulor.weebly.com/uploads/1/3/4/6/134640513/levejulinugu.pdf
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/6454644.pdf
    • https://tenaxujapem.weebly.com/uploads/1/3/4/3/134341928/d5ad07c8.pdf
    • https://cdn-cms.f-static.net/uploads/4417648/normal_5f95c31541ed6.pdf
    • https://xififaxapid.weebly.com/uploads/1/3/4/3/134344339/noxafamuzinu.pdf
    • https://cdn-cms.f-static.net/uploads/4488323/normal_5fae7fb16f7e0.pdf
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/2763505.pdf
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/88016d4392f776.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuxadol/86138265863.pdf
    • https://static1.squarespace.com/static/5fc066bd9955c744b5390948/t/5fc0ea0e18e72e5fdbf8b6f1/1606478350705/80396783531.pdf
    • https://s3.amazonaws.com/xeroguru/outlook_computer_login.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d469.bin
7e288858f6ae3545401d5e22f8cd86f0c2cde0e0b4b86dfdb97fe238086b9432
pdf-font-stream PDF embedded font (sfnt) at offset 0xD469 5224 bytes