Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de4cdd23afab9ad…

MALICIOUS

PDF

76.7 KB Created: 2021-04-08 07:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1af058c82fb2937a8ae56dba1e97fabb SHA-1: 92e9a192c0892ef267fe8d1b80728c063191bf51 SHA-256: 3de4cdd23afab9ad8181dd3b086d0b42057525fed4a2c9502c858dcbcbf49d1c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, characteristic of phishing or malware distribution campaigns. The PDF structure and embedded content suggest it's designed to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/strik?utm_term=is+american+journey+good+for+dogs
    • https://vifomamup.weebly.com/uploads/1/3/1/1/131163898/0cc1036e4.pdf
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/906068.pdf
    • https://static.s123-cdn-static.com/uploads/4382961/normal_5fe0d03880752.pdf
    • http://nitesufi.sportsontheweb.net/cavatina_guitar_tabs.pdf
    • https://cdn.sqhk.co/jevamivuvugi/ihgFkcd/buruwesibajusoridizuwe.pdf
    • http://natosabi.mygamesonline.org/canicula_norma_cantu.pdf
    • http://fujigukatujewu.medianewsonline.com/bowiworor.pdf
    • http://waverufusufafuv.scienceontheweb.net/upsc_zoology_syllabus_download.pdf
    • https://nurosamemozixa.weebly.com/uploads/1/3/4/3/134375837/wewul.pdf
    • http://legegapepapo.medianewsonline.com/digaluka.pdf
    • http://rodisawikikofu.medianewsonline.com/smaller_size_acrobat.pdf
    • https://cdn.sqhk.co/tixukiko/9hi4Bjf/emoji_movie_quiz_disney.pdf
    • https://static.s123-cdn-static.com/uploads/4452837/normal_5ff8fb97739d4.pdf
    • http://luwinilulurop.mywebcommunity.org/80324463168.pdf
    • http://lagidonak.mygamesonline.org/mojalafosewumepup.pdf
    • https://cdn.sqhk.co/gumojitoxowu/gejegf9/10304532199.pdf
    • https://cdn.sqhk.co/vonirosidejo/gfGjhgg/my_city_love_story_app.pdf
    • https://cdn-cms.f-static.net/uploads/4374181/normal_601a13de63fa9.pdf
    • https://cdn.sqhk.co/kopilixa/jcahg7f/oldest_football_club_in_english_premier_league.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dexadusoxeb.atwebpages.com/ccdp_arch_642_874.pdf
    • https://s3.amazonaws.com/xupimaral/tujotarijax.pdf
    • https://s3.amazonaws.com/doxifuba/valimijusidavis.pdf
    • https://s3.amazonaws.com/pavujiniz/jenokolozifufarutumonet.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_off0000ee24.bin
3bdc667160abf50d624f9acc401cc5f2a09be3e880e8bcf6e9e0ddcd52b32e22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 5424 bytes
font_01_sfnt_off00010090.bin
7e9702b82dc5a711e1ce9a0a231d0d134d38488b07e2866569a569028842b817		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 10840 bytes

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