Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a9692073589f65…

MALICIOUS

PDF

67.2 KB Created: 2020-11-28 15:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 27f1a9e082afae3388a2dadcb81dab8f SHA-1: 9c85b460ee828d8ddd3f040afb8c103b4afc339b SHA-256: d3a9692073589f65e96a3bc08bdb56ff3b5320be16b4c0275a3e2bf2e44920c0
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The presence of multiple disposable domains and UTM parameters suggests a phishing or scam campaign. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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://cctraff.ru/123?utm_term=jan+ken+pon+translation In PDF document text
    • https://liletizotefos.weebly.com/uploads/1/3/4/2/134234842/gikudabadumadak-likopudaw-dumenakotem.pdfIn PDF document text
    • https://gepipabatagik.weebly.com/uploads/1/3/4/7/134704213/punegupetama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f990d4834e3f.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/2776403.pdfIn PDF document text
    • https://wumaluko.weebly.com/uploads/1/3/4/7/134716396/1778702.pdfIn PDF document text
    • https://newogofifexepe.weebly.com/uploads/1/3/4/8/134884114/jaluvixetemuduk.pdfIn PDF document text
    • https://safadusuxujex.weebly.com/uploads/1/3/4/3/134319972/9438233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5f9d62a2d1807.pdfIn PDF document text
    • https://fizolapojola.weebly.com/uploads/1/3/1/3/131383549/nekuzetetimatu-jesalijitubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410727/normal_5fb5dfb62165d.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/fewunadupop/junafubosinopekowub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B3 2880 bytes
SHA-256: 5f03d2c6bc08d28d18892b3fd5153044a2fff6aad81dd629dfd07635bf6cf50e
font_01_sfnt_off0000cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 4868 bytes
SHA-256: 2f034e25d47ca0ffb095c2d3f85bbde0527bb4dd6c121be1821cbf288f0ac30a
font_02_sfnt_off0000dc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC91 10440 bytes
SHA-256: 12b55a64bc44cfeace3c065439a9584610b035ed8d0b4e302b5953fdd9cda593

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