Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e3cd0c49002323…

MALICIOUS

PDF

69.4 KB Created: 2020-11-18 11:03:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9f3009da519b9eee0fa3979ed15636f SHA-1: 5cd25fd51be69ef6967bf590ad0e432950f15a97 SHA-256: 25e3cd0c49002323023b5949336dcf793477c90141988ff16108fdce3285ce4c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. The presence of a URL pointing to 'traffine.ru' with a query related to downloading software, combined with ClamAV detection and ML classification, strongly suggests a malicious intent to trick users into downloading malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=tubemate+apk+file+download+latest+version
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/5d6f2da.pdf
    • https://kakezilek.weebly.com/uploads/1/3/4/4/134401463/6ea37a.pdf
    • https://juzugimigiroteg.weebly.com/uploads/1/3/2/3/132302883/4018888.pdf
    • https://xobiverubagosag.weebly.com/uploads/1/3/4/7/134711173/ruputujolobege.pdf
    • https://suvejuxib.weebly.com/uploads/1/3/4/3/134380783/fadavo-joxiganifoboju-wimufujujad-sumolevilawov.pdf
    • https://wukaxasupureje.weebly.com/uploads/1/3/4/4/134440875/f71970189a2e.pdf
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/jobadamex-gonobamoda-femixixaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bisazabe/51531722635.pdf
    • https://s3.amazonaws.com/vapite/area_mixed_shapes_worksheet_answers.pdf
    • https://s3.amazonaws.com/najubu/pimojodutowelu.pdf
    • https://s3.amazonaws.com/retobifulipo/zilikoxemewuwukof.pdf
    • https://s3.amazonaws.com/kalufizefem/open_and_closed_systems_geography.pdf
    • https://s3.amazonaws.com/levovod/one_dimensional_array_in_c.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_off0000c5a9.bin
a39189edffe237fc4ee2ce5c0c14fb9814503558de05c33dc8fe12063e40acd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A9 5372 bytes
font_01_sfnt_off0000d7e7.bin
174c78e07915392b82416d405f1ba3a70c967b8c16dccfb98c6406dcc20278ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 10164 bytes
font_02_sfnt_off0000fab5.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 4324 bytes