Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf63461464c48ead…

MALICIOUS

PDF

78.7 KB Created: 2020-11-19 06:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d599e9abab2839a2a308a4457ea243f6 SHA-1: 5d5c1aa29eb7dad5b77e7fbb87588db77915d0c4 SHA-256: bf63461464c48eadc22c3417345a15973429d7e22947580ff0b8fd04f7990c20
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and S3-hosted PDFs, indicative of a link farm or content distribution network for malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://trafficel.ru/aws?utm_term=pension+drawdown+calculator+excel+spreadsheet
    • https://dexajuvado.weebly.com/uploads/1/3/4/4/134470202/jirumiv.pdf
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/sijakezivexos-nafugeribeg.pdf
    • https://cdn-cms.f-static.net/uploads/4379733/normal_5fa066565c1a4.pdf
    • https://cdn-cms.f-static.net/uploads/4413345/normal_5fa76ba7bd41a.pdf
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f9920b5c2401.pdf
    • https://cdn-cms.f-static.net/uploads/4393883/normal_5fb5de7a908b4.pdf
    • https://cdn-cms.f-static.net/uploads/4455681/normal_5fa45f2de31c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pizexopenaxu/nopuxum.pdf
    • https://s3.amazonaws.com/tuxutedi/pediatric_physical_therapy_assessment_form.pdf
    • https://s3.amazonaws.com/bejenosugede/weber_meat_thermometer_guide.pdf
    • https://uploads.strikinglycdn.com/files/a1e33ff4-2285-4f06-9126-8f4650709446/dipusipanukusibazuleneje.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e889.bin
86024d08ac04b173a511ac948f801e99aea2efcf1622a7544a9ee7d48cbdef15
pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 5204 bytes
font_01_sfnt_off0000fa3c.bin
fe6ec5282bb7f64be409aedb42fcb8583360dbcb997156a0d7adcd72ffa7dcd4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 11028 bytes
font_02_sfnt_off00012005.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 4324 bytes