Malicious PDF — malware analysis report

Static analysis result for SHA-256 31636b89bebca91d…

MALICIOUS

PDF

91.1 KB Created: 2021-03-02 23:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 61d5197c0ef373ea693b9d5d79fa1ffc SHA-1: f01c99b3a60689cdfcd0d9cc17df64349198306b SHA-256: 31636b89bebca91df8954c94671fb3f5323e11e72ca67e1e8e209cf4eb848ca6
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file contains a large number of external links, many of which are hosted on disposable domains and redirectors, indicating a link farm designed for SEO manipulation and phishing. The presence of a critical heuristic for brand-impersonation credential phishing, specifically impersonating Amazon, further supports this. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing campaign aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kifadinegek.weebly.com/uploads/1/3/1/4/131407901/4193105.pdf.
  • 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://lozipotod.ru/award?keyword=attack+on+titan+manga+wiki PDF link annotation
    • https://cdn.sqhk.co/duputokodoz/eScjdTq/dapexevewo.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/icjf9gc/boosted_music_player_equalizer_pro_apk.pdfIn PDF document text
    • https://kifadinegek.weebly.com/uploads/1/3/1/4/131407901/4193105.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/nLhdggy/free_cubes_for_blockman_go_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/jifjeig/11867354272.pdfIn PDF document text
    • https://fogofude.weebly.com/uploads/1/3/4/3/134322730/865477.pdfIn PDF document text
    • https://gabukoxikala.weebly.com/uploads/1/3/3/9/133997771/8930936.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/cIv5wp0/83147389589.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/ihjphlX/color_maze_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/hhjNigf/giant_neostrack_gps_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/BUid5jb/street_basketball_theme_song.pdfIn PDF document text
    • https://cdn.sqhk.co/bisadumiza/fuidJgc/30827421415.pdfIn PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/zomiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/zazerejaxu/hfhjKid/simple_cake_decoration_pics.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/xichdgj/mlg_meme_soundboard_scratch.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/mR9jfhe/junufog.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/e2LSjj2/endless_run_jungle_escape_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/ibhfNoH/ikea_furniture_bedroom_side_table.pdfIn PDF document text
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/niloba.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/jegexokilumuwug.pdfIn PDF document text
    • https://wijinopupog.weebly.com/uploads/1/3/5/3/135323990/xapinew-wuximutero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 13728 bytes
SHA-256: 0dddec6b3a74b0d1454db3ba2e8fbef3bc9e383fe47360c8f765495d7e64fd6c
font_01_sfnt_off0001288c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288C 4960 bytes
SHA-256: f9462dfd95e85b888dedc07e3fa6c962ffa8d30587c6a1c77a69c755b4674040
font_02_sfnt_off00013974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13974 10960 bytes
SHA-256: 686cd4e4a67032f91c0e88847f0a4e41e1f6644665d68c2bab7992e31f69fd77

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