Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90618cba4cee013…

MALICIOUS

PDF

75.5 KB Created: 2021-01-15 12:07:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bb79352268b68168047eb302ec58fa09 SHA-1: c30d220015d8bd770b504b6e4ff071ac138b6ada SHA-256: e90618cba4cee0131bbf1fdb05365597d79dc01e60e1b12a786005f192b908ef
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, with several identified as malicious redirectors or part of a link farm. The document body, though heavily obfuscated, appears to reference a game guide, suggesting a lure to entice users to click on the malicious links. The presence of ClamAV and ML heuristic firings further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://traffmen.ru/123?utm_term=tibia+druid+power+leveling+guide In PDF document text
    • https://cdn.sqhk.co/borefigux/jhgfiib/helix_tower_jump_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5fde3226a1169.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/jgS0eij/second_galaxy_game_review.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/rafifu.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/soxakogu-pemiboki-dasepab.pdfIn PDF document text
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/novuzopub.pdfIn PDF document text
    • https://rereviraret.weebly.com/uploads/1/3/4/5/134512362/xadolazurare-rojurujadugijo.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/mawesenasijoser/santo_es_el_senor_chris_tomlin_letra.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/81853084193.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/calendario_f1_e_motogp_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/bodupiwudilesokitome.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/19255612337.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_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 5188 bytes
SHA-256: 14267fe65f20350bdffd1debcea04c3ea292ec586152e192bbcd90e77554e56b
font_01_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 10884 bytes
SHA-256: 9da6e169cd0ee35e3e4da25577236f3e8e04013be57ed5c57626c6fcb8fa6810

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