Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9c5dd3648d617d…

MALICIOUS

PDF

74.8 KB Created: 2021-01-15 14:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2e0e31274992cefcb2babb1b9e18260 SHA-1: ee79a6d23b5af797eb8eafa5d907e621acd0f2d3 SHA-256: da9c5dd3648d617da3e9118b04a6c1207721ab60822ce32729e8d8eb10ae612a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://trafftec.ru/123?utm_term=kgw+live+stream+blazers
    • https://site-1178342.mozfiles.com/files/1178342/tank_battle_east_front_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5ff195fae02ed.pdf
    • https://static.s123-cdn-static.com/uploads/4450884/normal_5ff96fc75f2e0.pdf
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5ff492faa3825.pdf
    • https://cdn-cms.f-static.net/uploads/4387928/normal_5fb870d5a1ca9.pdf
    • https://zilisekisami.weebly.com/uploads/1/3/1/4/131437354/9503802.pdf
    • https://cdn-cms.f-static.net/uploads/4470961/normal_5fd72ce84381b.pdf
    • https://cdn.sqhk.co/vipikunowi/fb6uhaE/camera_studio_stand_used.pdf
    • https://cdn.sqhk.co/limizolaxa/dTGfahf/free_full_length_comedy_movies_on_youtube.pdf
    • https://rakafofolobe.weebly.com/uploads/1/3/4/6/134649319/5340325.pdf
    • https://cdn-cms.f-static.net/uploads/4403404/normal_5f969de6179aa.pdf
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5fdad82301ca8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/degisapemifa/pamefikesamoj.pdf
    • https://s3.amazonaws.com/wonoti/rewugewesuzutelatufipero.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_off0000e81a.bin
46b00e0501b41a91da36cae405db373233c93b2d9cee49fdd1d6d946647d0816
pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 5316 bytes
font_01_sfnt_off0000fa42.bin
1d11e45d9f395f6ee1a0b02da76d554682264d063b2c4cb1d393d97c29be4218
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 10700 bytes