Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ecb7cd2368aa1b…

MALICIOUS

PDF

73.0 KB Created: 2021-02-13 16:37:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ac49f67d293b7911aeb0048c3e7fbeb SHA-1: 2916ba523bf99f44d481e46c442f0063d8d02e07 SHA-256: c4ecb7cd2368aa1b902f8c4bdff49c2cb7db25ddca8af930043e357d80dc331f
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 spam and phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting an attempt to drive traffic to malicious or low-quality content. The embedded URL 'https://leonvi.ru/wix?keyword=dead+trigger+2+hacked+apk+download+android' further suggests a lure related to software downloads. While no scripts were explicitly extracted, the presence of external links and the ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=dead+trigger+2+hacked+apk+download+android
    • http://hd-cam-mirror-up1.club/5688923447ufm8q.pdf
    • http://particulieres-societegenerale.best/45090386092xj94g.pdf
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/kibidemaloregazid.pdf
    • http://fsbsiod.com/bebas_new_bold_fonti3amw.pdf
    • https://static.s123-cdn-static.com/uploads/4496853/normal_5fcb317245509.pdf
    • https://cdn.sqhk.co/jutafegobexe/Uhcifvt/37202060455.pdf
    • https://rolobidixogiru.weebly.com/uploads/1/3/1/6/131637372/7182362.pdf
    • https://cdn-cms.f-static.net/uploads/4417986/normal_60254a673b136.pdf
    • https://zapowiwowo.weebly.com/uploads/1/3/0/7/130776131/8f69a.pdf
    • http://fresh-ita.space/alien_vs_predator_pc_game_199906yiz.pdf
    • https://nezopubetuw.weebly.com/uploads/1/3/2/6/132681339/bozedukopevosox.pdf
    • http://taygerr.com/34499210857s9arf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/benubapopikaj/tojifomobozaxarup.pdf
    • https://s3.amazonaws.com/fukepez/82400673795.pdf
    • https://s3.amazonaws.com/gawabog/68930897208.pdf
    • https://s3.amazonaws.com/rogugagatuf/24244073982.pdf
    • https://s3.amazonaws.com/zamemigojat/apsc_prelims_syllabus.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de0d.bin
b92e5c16a249dc4d7c7907157aa31f629b735d0b32debad51715dc0e2aa201e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 5444 bytes
font_01_sfnt_off0000f0a8.bin
342c3a2fe9f5f483c530bd7652f48754831060f80f70d86b06828f6d5140755d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 10684 bytes