Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d03b5dbdb2350e9…

MALICIOUS

PDF

82.5 KB Created: 2021-05-10 09:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 946039f22e94abda887e67178f430fd0 SHA-1: af121a6c201826378d572c1777bf2eaecf9f5605 SHA-256: 5d03b5dbdb2350e96c98d3d2be05f0a650300e01fb1d61e92f60618ee267d50d
166 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains references to 'crusader kings 2 free download', suggesting a lure to trick users into visiting a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://golowaki.ru/strik?utm_term=crusader+kings+2+free+download+3.3 PDF link annotation
    • http://boguzimaro.getenjoyment.net/48510619289.pdfIn PDF document text
    • http://becloud.website/kovokoxovurelesaxozajibofgza21.pdfIn PDF document text
    • http://rolevuses.iblogger.org/76092673374.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://fefikaniki.22web.org/van_helsing_2016_parents_guide.pdfIn PDF document text
    • http://sk-anker.ru/how_to_take_apart_a_ingenuity_bouncernjsse.pdfIn PDF document text
    • https://cdn.sqhk.co/tememukafosu/ghhjggV/81798254157.pdfIn PDF document text
    • http://agentsecure.space/chokher_bali_book_in_bengalitashj.pdfIn PDF document text
    • http://seplafond.xyz/59702390677hra24.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/jenjbhh/story_mode_minecraft_apk_download.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/bajaj_allianz_future_gain_plan.pdfIn PDF document text
    • http://sutivetowit.mypressonline.com/51813380509.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/fVwqvIn/kampf_der_titanen_schauspielerin.pdfIn PDF document text
    • http://bigwin-1xbet.fun/nitiwanis6vz9g.pdfIn PDF document text
    • http://matroskin.space/felotikifituxivib31rn5.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
    • https://uploads.strikinglycdn.com/files/017c71f1-3064-4523-81e3-2a4c27e660f6/calculating_specific_heat_practice_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77279b50-d1b7-41af-8ce2-1f47acab82c2/93183771938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1416f51c-5d66-4bd7-a694-127cd56b0bd9/83640924317.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/what_is_the_meaning_behind_the_nutcracker.pdfIn PDF document text
    • http://dokuzijix.epizy.com/rogisezudita.pdfIn PDF document text
    • http://bitines.myartsonline.com/arterial_hypertension_treatment.pdfIn PDF document text
    • http://budivisatenebo.rf.gd/blaupunkt_40_inch_led_tv_manual.pdfIn PDF document text
    • http://tesaminovosino.epizy.com/what_concept_is_best_explained_by_the_statement_money_spent_here_cannot_be_spent_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e97681d7-0d39-4d1e-8d37-c16cc275e329/tiboparatajixemabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6271d65-663b-4c4a-ad98-59b55d55eb85/whirlpool_wtw5000dw1_lid_not_locking.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_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 5384 bytes
SHA-256: 22ce00fa615d119fab742762a000000919859de3b42d504a15396ed5e9067a01
font_01_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 10480 bytes
SHA-256: 6f00e1428fee4162eb3486a138fafe811341410fb970a4583042ae983a907ea8
font_02_sfnt_off00012e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E19 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176