Malicious PDF — malware analysis report

Static analysis result for SHA-256 097043fd6c785202…

MALICIOUS

PDF

113.9 KB Created: 2020-11-27 11:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f9e57cc7a8f478a0126972767c3104af SHA-1: fe35addc3ea59b23e4a94dd479df98f28cddd9fb SHA-256: 097043fd6c785202d290b22f3c23ee6e6a241043a7e3baa6e55cb036a7208429
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including one pointing to 'trafffi.ru/aws', suggests it is part of a link farm or phishing campaign. The document body, though heavily obfuscated, contains references to 'app market apk for android', reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffi.ru/aws?utm_term=app+market+apk++for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491688/normal_5fb48d2cc828e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_5fa9da9fc9f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f8704122e084.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/7098927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5f88f6e09922f.pdfIn PDF document text
    • https://gitikatul.weebly.com/uploads/1/3/4/7/134749175/6936186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_5faecbd25d72d.pdfIn PDF document text
    • https://puziwifatewir.weebly.com/uploads/1/3/4/7/134715637/6078422.pdfIn PDF document text
    • https://nixejovebomir.weebly.com/uploads/1/3/1/3/131380485/9560553.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/calcium_hydroxide_iodoform_paste.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/62849853825.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/anatomy_knee_joint.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_off000183d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183D8 5028 bytes
SHA-256: 491b3a29e63fff054d8f49962b5c6bcaa81871cdb0885da564a66ac4e754363b
font_01_sfnt_off000194e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194E2 11248 bytes
SHA-256: af7ef32815382cfb7e11895314eda8914ef98108ed56fc200a4be90b5a4fda3a

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