Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2041ef2c8465c5…

MALICIOUS

PDF

61.9 KB Created: 2020-12-20 16:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23427cbd149628ddc90a8eb3646a84d8 SHA-1: 2b3a3c61f6e5d63c4f8f3c25c4de87b07e6b900f SHA-256: 0b2041ef2c8465c55241ebfbca11721dd4c9aa7dddd73a205cc52e100e283d96
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites. The heuristic 'SE_URGENCY_LURE' suggests the document attempts to create a sense of urgency to encourage clicks. The primary malicious URL identified is traffnew.ru, which is likely used to host phishing content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffnew.ru/strik?utm_term=tap+to+talk
    • https://cdn-cms.f-static.net/uploads/4380692/normal_5f98c6fd6cd82.pdf
    • https://cdn-cms.f-static.net/uploads/4382407/normal_5fdc7dabb593e.pdf
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/zetaxebo-wokegutu-vuwaz-tipimamigisufu.pdf
    • https://static.s123-cdn-static.com/uploads/4426699/normal_5fc74a03a075d.pdf
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5f94c04b0793e.pdf
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5f8bca2b828df.pdf
    • https://cdn-cms.f-static.net/uploads/4383921/normal_5f8ec20aaba5e.pdf
    • https://cdn-cms.f-static.net/uploads/4389085/normal_5faf085088d8c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lemefofutomapox/transparency_paper_crafts.pdf
    • https://static1.squarespace.com/static/5fc5af5f12facd59cecdbb78/t/5fc7f674d89c4f4741ec4e8e/1606940276884/88168046735.pdf
    • https://static1.squarespace.com/static/5fc5176dd49dd124474f549c/t/5fc884138bd779356753941c/1606976532061/gangstar_rio_city_of_saints_game_for_ios.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_off0000b9c0.bin
c3cf549b4d7224e14a2b3a2213d142520d425d98fc1ca0f5a178b696abe1c09e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C0 4552 bytes
font_01_sfnt_off0000c94f.bin
914e84036220a8160bf0273f68d5beedc069c406e84e6be59398384921ddddc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC94F 9980 bytes