Malicious PDF — malware analysis report

Static analysis result for SHA-256 3867ae76cb490981…

MALICIOUS

PDF

72.7 KB Created: 2021-01-26 16:39:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b716f127fe88c5b11861748695b6a50a SHA-1: b566bd632ff5005cef92d125c2cdb9da5ffc8162 SHA-256: 3867ae76cb490981e94c997684c207527ddf1979421be18122c5c0a4c4166fb3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?utm_term=berlin+center+united+methodist+church+berlin+center+oh
    • http://mediaverifiedbadge.com/zenuponexorojegy8c0.pdf
    • https://cdn.sqhk.co/jujadiziga/tigif86/jbl_link_10_play_apple_music.pdf
    • http://viwimewi.22web.org/apostrophes_plurals_worksheet.pdf
    • http://bcpzonasegurape2-viabcp.com/mad_man_after_doomsday_apk_downloadey8a2.pdf
    • http://keep-travel.com/callaway_supersoft_magna_yellow_golf_ballstavfq.pdf
    • http://homiak.fun/amazon_music_prime_coston9b56.pdf
    • http://lasns.fun/komumixebuzifatojilupikov0vyn.pdf
    • http://summer-italy.fun/rasevawexokagipegisuzewevb6uka.pdf
    • http://madewithsunshine.com/edpuzzle_answers_key_hackuayie.pdf
    • https://static.s123-cdn-static.com/uploads/4497346/normal_5fcc5382436ea.pdf
    • https://cdn.sqhk.co/dodagirojep/Ehh2gdA/lucky_block_race_popularmmos.pdf
    • http://albatros-trans.ru/animal_print_carpet_runner_for_stairsjpvw9.pdf
    • http://vzale.ru/maps_for_mcpe_androidenr8x.pdf
    • https://cdn.sqhk.co/vizoxaxijojo/bihdjDb/pee_wee_herman_laugh_soundboard.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jofawapedoguw.rf.gd/72507526891.pdf
    • http://fetapewifug.epizy.com/13839569455.pdf
    • https://s3.amazonaws.com/lebaxa/vanudov.pdf
    • http://povuputuk.epizy.com/carriers_2009_full_movie.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c66b.bin
2849478ceb7d83eaf53c431ef6d2db7e04076f631a4c954fac16dfc27af207b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC66B 5160 bytes
font_01_sfnt_off0000d7cb.bin
d62d9e654e6e8c576fa107ae87a9c8ea42ea71fd320a7debb80ae745de40fade		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 11792 bytes
font_02_sfnt_off0000fdab.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 16204 bytes

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