Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa6ac772ee3ef1c…

MALICIOUS

PDF

88.6 KB Created: 2021-02-19 22:36:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 427b7a64e36f252d53fd0ad2a0ca5371 SHA-1: 710fce4b1c4202c9e3ed4398630fef8220ca8f81 SHA-256: afa6ac772ee3ef1c5710f31dbe8bb881377fb9e72d5831445a1fabb755ff4b58
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests an attempt to redirect users to malicious content.

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://crophysi.ru/wix?keyword=schooled+by+gordon+korman+novel+study
    • https://cdn.sqhk.co/birenejar/Qhhheo8/popular_apple_ringtones.pdf
    • https://cdn.sqhk.co/boxepupovemu/f1qzMhb/blocky_superbikes_race_game_motorcycle_challenges.pdf
    • https://static.s123-cdn-static.com/uploads/4387703/normal_5ff91037763cc.pdf
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/zaxeju.pdf
    • https://cdn.sqhk.co/samekikogeri/idaP6id/twister_movie_music_video.pdf
    • https://cdn.sqhk.co/poxudanefisi/ij6gjpU/word_calm_answers_level_95.pdf
    • http://kyhni.site/where_do_you_get_bubble_tea_near_medvic4.pdf
    • https://cdn.sqhk.co/ruzemesafe/j6R6aie/pebokozekajejime.pdf
    • http://madamzero.com/the_beatles_piano_songbookbk4ts.pdf
    • https://wifajeru.weebly.com/uploads/1/3/4/3/134342489/darewodimew.pdf
    • https://static.s123-cdn-static.com/uploads/4382643/normal_5fed12d2ea6c6.pdf
    • https://cdn-cms.f-static.net/uploads/4392439/normal_600d35b2abce4.pdf
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/be370.pdf
    • https://cdn.sqhk.co/tisufupujeli/Hgd9ieO/raxidanafofibisewuwab.pdf
    • https://gajuleli.weebly.com/uploads/1/3/1/8/131871701/viminojogeku.pdf
    • https://cdn.sqhk.co/tajiwikiter/Kuuhix1/sultan_mp3_song_free_download_mr_jatt.pdf
    • https://cdn.sqhk.co/xogovofofi/ieBic9S/age_of_conquest_iv_tips_and_tricks.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00011dae.bin
7c1cfac02ca6094547661b63d4c53f5c30934b826b9ae8634f7ddf62524247c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 5820 bytes
font_01_sfnt_off0001315b.bin
c161d1e8d71ab6c6dfd9a2c73901575676178fd9b7a4e059fc6ba4f051fc9d29
pdf-font-stream PDF embedded font (sfnt) at offset 0x1315B 10528 bytes