Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4270868c0cf962…

MALICIOUS

PDF

74.4 KB Created: 2020-12-26 01:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 598f6aa99efb56763d73ce12388243e9 SHA-1: 902b4a5ccad97d6acc22b13600d7e9c82565184e SHA-256: 6b4270868c0cf962d8544d8367decab78e6a8056ef0582b60e9acb92189b6e46
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one specifically to a known malicious redirector. The document body, though heavily obfuscated, contains keywords related to translation, suggesting a lure. The presence of numerous external links and a malicious redirector indicates an attempt to drive traffic to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://gettraff.ru/aws?utm_term=translate+excel+spreadsheet+japanese+to+english In PDF document text
    • https://donaxitod.weebly.com/uploads/1/3/4/6/134688316/dawip.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/ggjjjjA/34028764715.pdfIn PDF document text
    • https://sewokowoxukipa.weebly.com/uploads/1/3/4/8/134846336/fba42c00b721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f87efa254189.pdfIn PDF document text
    • https://fopezifu.weebly.com/uploads/1/3/4/7/134717551/sowavivebawida.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/d1deff04277.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/a3b553f00eef.pdfIn PDF document text
    • https://cdn.sqhk.co/wepenujofow/cBjiDib/the_chosen_book_movie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/rakowawerorunujigarex.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/vapejubuvodiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e2c7743-48f1-4225-a9dc-21932264f09c/nebivobetokupodulil.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_off0000d94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 5216 bytes
SHA-256: 1813f4e0f30fb0aaa920a0ea34a818b46d6723dc0d96ac6a05f7f2d654a9cdc6
font_01_sfnt_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 10472 bytes
SHA-256: af616b6627d0c7981568a3b9d58d01ca6d7385ed54364b5f9582139db0cc18ae
font_02_sfnt_off00010e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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