Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25992c9b4aa69ca…

MALICIOUS

PDF

66.3 KB Created: 2021-02-09 12:07:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 386c9bfeabd351baaaa7d99167ce6cb4 SHA-1: 9e5444c9ef0471a71f2f7f48077ed13449e27990 SHA-256: a25992c9b4aa69ca1669876d2d7d059d024728d652e82738ca94b15d6a582434
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high density of links pointing to potentially malicious or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wb?keyword=native%20tribe%20ancestors%20calling PDF link annotation
    • http://goossyy.online/film_korea_frozen_flower_sub_indol6fzc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446924/normal_5ffdbb0b34f22.pdfIn PDF document text
    • http://gijutudubesakuz.iblogger.org/naturalism_vs_realism.pdfIn PDF document text
    • http://steh-sistem.ru/parts_of_speech_practice_with_answersro3p8.pdfIn PDF document text
    • http://azalea.store/9015373838108qv5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_5fe86ddaad604.pdfIn PDF document text
    • http://kapubasezo.iblogger.org/stardew_valley_fair_stardrop_guide.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/escape_plan_2_hades_imdb_parents_guide.pdfIn PDF document text
    • http://yarrebitteh.online/8773496579332xdj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_6015e1e5769e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pisik/vidotivimonolexox.pdfIn PDF document text
    • http://lujolugajejizog.epizy.com/19547538204.pdfIn PDF document text
    • http://bezopiwuzalobit.rf.gd/anagram_magic_square_answers.pdfIn PDF document text
    • http://fakesux.epizy.com/osrs_ice_gloves_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/17066819081.pdfIn PDF document text
    • http://kedokonox.rf.gd/10144765260.pdfIn PDF document text
    • http://sijurajogo.epizy.com/zijan.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/sabizag.pdfIn PDF document text
    • http://vusevupitiwo.rf.gd/mopifafumajujitiwonelo.pdfIn PDF document text
    • http://zivufev.rf.gd/sololearn_css_shortcut_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/android_get_wifi_password.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC786 5136 bytes
SHA-256: a215638e130abecb47a8ec05c113a0dd413e8a0c40d5c277665d47c120e67d11
font_01_sfnt_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 10168 bytes
SHA-256: 8bc4f528f21cde3eced86a03171fc50ff238855b024bc1d53ad02c3b2e48b21d

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