Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e3e92dece29e5a…

MALICIOUS

PDF

76.5 KB Created: 2021-02-04 06:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0205e970919cdb728f24c7019588f816 SHA-1: 41eb8c7dd87974070d29de20f1360f1646842daf SHA-256: a4e3e92dece29e5a4f789efa4424dce2fc7ec2338b748f99f5a0ef9b731274f7
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains references to 'Chrome installer' and the presence of numerous external URIs, many pointing to link farms on disposable hosting, suggests a lure to download malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a deliberate attempt to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/aws?utm_term=chrome+installer+for+windows+server+2012 PDF link annotation
    • https://cdn.sqhk.co/sulugedako/QQogdgi/48172555585.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/eqkvnii/immigration_and_nationality_act_212_e.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/inRlgip/the_chosen_episode_2_review.pdfIn PDF document text
    • http://vijufik.iblogger.org/tamil_movies_list_of_websites.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxinugad/jhhh7hd/wiwusagirosevimuruveji.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/eROhjmU/55345540219.pdfIn PDF document text
    • https://cdn.sqhk.co/revipidamog/VduCbSM/81736161888.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bosurigazo.epizy.com/bubble_bubbles_game.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/bulandi_old_movie_songs_free.pdfIn PDF document text
    • http://moferamobonar.epizy.com/win_media_player_10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/60919054665.pdfIn PDF document text
    • http://motinekan.epizy.com/kuwoxalubekunutin.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/55085149576.pdfIn PDF document text
    • http://pujusojup.epizy.com/denirulesebiwiseropifa.pdfIn PDF document text
    • http://kofipazefoleris.epizy.com/formation_yield_management_hotellerie_paris.pdfIn PDF document text
    • http://xefejada.epizy.com/waxorevunivesokekejoxugob.pdfIn PDF document text
    • http://puriwevusireda.rf.gd/bluebeam_vu_2016.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 5436 bytes
SHA-256: a60e721868762b7237e75c31a4f492b529fdfd33564671fea9b3b84a659d7480
font_01_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 10236 bytes
SHA-256: 4f5611dd1bd844c2829a72cc5af51c4dd38258676ddb87d0ca283ee578e064d5
font_02_sfnt_off000116b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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