Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e4c231279e2555…

MALICIOUS

PDF

76.0 KB Created: 2021-03-09 12:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37857809cb737ec0d7fc4b22279b8621 SHA-1: 7a2d868f5259474eddfa820f25148e27c114b9f0 SHA-256: d4e4c231279e25556c5262c57eb218b4e696dd879b8508f1180723a0c6adaaf4
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'golowaki.ru', which is likely part of the phishing lure. The document body, though heavily obfuscated, suggests a lure related to 'ccna intro exam certification guide pdf'. No scripts were extracted, but the PDF structure itself facilitated the malicious URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://golowaki.ru/award?keyword=ccna+intro+exam+certification+guide+pdf
    • https://cdn.sqhk.co/jakatote/yN2idrk/susatoweremeso.pdf
    • https://cdn.sqhk.co/xexisini/2cjcggd/hello_dolly_cast_list.pdf
    • https://cdn-cms.f-static.net/uploads/4495551/normal_5fd26bd5b0c60.pdf
    • https://cdn.sqhk.co/kerosumumato/gjhfxge/nuzizopegedurixomopeje.pdf
    • http://jenirafona.22web.org/allow_notification_permission_android.pdf
    • https://static.s123-cdn-static.com/uploads/4447280/normal_5fc96a60692a8.pdf
    • https://static.s123-cdn-static.com/uploads/4373297/normal_5fdfd6363fb53.pdf
    • https://cdn.sqhk.co/terisuzuji/kgcgfnt/91076002727.pdf
    • https://cdn.sqhk.co/pemiduwegam/gfxDjgN/nabovute.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://modedavap.epizy.com/biblia_vanzarilor.pdf
    • http://saxutidiroza.rf.gd/rofovuzefasilugujuxekit.pdf
    • https://uploads.strikinglycdn.com/files/bdd1b5f4-0ead-4a56-866e-261b287198b8/piano_adventures_levels.pdf
    • http://jidojig.epizy.com/elementary_set_theory_book.pdf
    • https://uploads.strikinglycdn.com/files/19a4b149-24fb-4b04-9206-68f3e3a89fb5/will_there_be_a_monster_in_paris_2.pdf
    • https://uploads.strikinglycdn.com/files/4cc850d1-c542-46ad-8673-a27ca2d50bed/how_to_use_dyson_ball_multi_floor_2_attachments.pdf
    • https://s3.amazonaws.com/widofafane/lejigububep.pdf
    • https://uploads.strikinglycdn.com/files/c3f44270-2620-47a5-ac3b-9659c5cdf3bb/how_to_reset_ge_spacemaker_washer.pdf
    • https://uploads.strikinglycdn.com/files/bd569148-d459-4a67-b250-1a9a40502867/6074197927.pdf
    • https://s3.amazonaws.com/xofalepelala/81644251008.pdf
    • http://refesare.epizy.com/weber_bbq_best_price_sydney.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_off0000eb26.bin
8ff882bf58d4bc63a6a23d3b7890b3518dcf8c67d6ad751950f43a832b531ab6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 5240 bytes
font_01_sfnt_off0000fce9.bin
6c9b4724e1a797db9cd14582ae593f25e284f1ea66ac4f98cb02b222bb981629
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 11120 bytes