Malicious PDF — malware analysis report

Static analysis result for SHA-256 704d3072367f0d6a…

MALICIOUS

PDF

66.2 KB Created: 2021-01-08 09:17:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e2ec1eae3ec5b9ff0ddf522e372f2141 SHA-1: 6c4584ec5e48291441f0b7a760ae30e1a5d5b410 SHA-256: 704d3072367f0d6ac0a3a71c20ddcc8afb04ad45bd4f30c1b990351df06954cf
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection scheme to distribute malicious content or phish users. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/aws?utm_term=lagu+balungan+kere+koplo+metrolagu PDF link annotation
    • https://cdn.sqhk.co/gofelaxes/gfihKid/73920033589.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/hj0ja8f/secret_codes_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413457/normal_5fadd30829906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_5fdae9a3505cb.pdfIn PDF document text
    • https://dadekojulaza.weebly.com/uploads/1/3/4/3/134320805/3829780.pdfIn PDF document text
    • https://jafovoguna.weebly.com/uploads/1/3/4/0/134096268/sovul-baboxopexaj-wubedozuvid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488569/normal_5fc564b3d3125.pdfIn PDF document text
    • https://jeretidaker.weebly.com/uploads/1/3/4/5/134595905/refinapexutemav-pakalus-wuvukinojukolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_5faec017485bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462775/normal_5fd0fe0b25661.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BD 5108 bytes
SHA-256: a88e989615c5be96adf0a6b2c0bd7a963e90fe9b4b46a4bed8ef0568eb9f375f
font_01_sfnt_off0000d710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD710 10744 bytes
SHA-256: ab4390b994a0e65326d4702a8b14f430f38dd7c466936809aa9d6b51c750b1de