Malicious PDF — malware analysis report

Static analysis result for SHA-256 85305c0991ac0fb1…

MALICIOUS

PDF

76.4 KB Created: 2021-03-18 10:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 957d2496932a8cb12f45aaa0fab6d166 SHA-1: bce6d77c74823310b901c2c0f4042ca7a48dfad2 SHA-256: 85305c0991ac0fb1f89d0f163f4385d4189689db2683b56b41392f1187ceae83
156 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 disguised as search results for product parts, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or leading users to phishing sites. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

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-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://maypoin.ru/wix?keyword=greenworks+1950+psi+pressure+washer+parts
    • https://mazefitarunakur.weebly.com/uploads/1/3/1/4/131453858/9191f44.pdf
    • https://jukosixosibi.weebly.com/uploads/1/3/1/8/131871462/zudug_xoronunogile.pdf
    • https://cdn.sqhk.co/lijipatalenu/ndZifgc/drawing_games_3d_apk.pdf
    • https://cdn.sqhk.co/wakewafo/hdgejdy/prodigy_math_game_level_hack.pdf
    • http://pewekelexu.mygamesonline.org/57303410274.pdf
    • https://miduginoxem.weebly.com/uploads/1/3/4/8/134892771/2950279.pdf
    • https://cdn.sqhk.co/vekuperik/4Msgihd/pimanizudivojemomekopad.pdf
    • https://cdn.sqhk.co/wakewafo/jdgiYoP/ganodinubofufef.pdf
    • https://nidatufibamukun.weebly.com/uploads/1/3/4/1/134131265/xoref.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_dd243296ea6a47148996b8ac2a96465e.pdf?index=true
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_c64f3cfa35264e1488f943dab515a938.pdf?index=true
    • http://rujetekanag.epizy.com/25194383279.pdf
    • http://zirutabu.myartsonline.com/54564036154.pdf
    • http://vixekufu.epizy.com/evh_5150_iii_50w_6l6_amplifier_head.pdf
    • http://vudasuluwiviwaj.rf.gd/66253914090.pdf
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_70acfd8403d5458db50345b40f38ea4b.pdf?index=true
    • https://d4e9107b-ea7a-46dd-9434-10729a3140ee.filesusr.com/ugd/2e3df4_f551c5662e3947b193f24a0589674c6c.pdf?index=true
    • 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_off0000eced.bin
70a05db780083a28e480e4196c61071f82602150d4b0c53c51efbfedae66a38e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 5536 bytes
font_01_sfnt_off0000ffd7.bin
c3f22934368f8dfc337d42bdecda4765117b7853c96a54542601244e6234aad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 10640 bytes

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