Malicious PDF — malware analysis report

Static analysis result for SHA-256 3849dcd40e931df6…

MALICIOUS

PDF

89.1 KB Created: 2021-04-21 10:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1844fbb35e1db3c89761a8355bfb38ae SHA-1: 768efdce8c4ac940ec90dfca17ea739efed948ee SHA-256: 3849dcd40e931df6996a74ca1b5b94ff7292b82963bc7f3174369c3925ccf7ef
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable domains or redirectors, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farm characteristics strongly indicates an effort to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/strik?utm_term=cognitive+theory+psych+def
    • http://norikaloro.mywebcommunity.org/bexixetomaz.pdf
    • https://cdn-cms.f-static.net/uploads/4447093/normal_6048ccdf71c6f.pdf
    • http://kaxazul.iblogger.org/rulewamelinukobewin.pdf
    • http://jarisudowapebi.sportsontheweb.net/96452128033.pdf
    • https://cdn-cms.f-static.net/uploads/4448750/normal_6041f2a698132.pdf
    • https://pirusamu.weebly.com/uploads/1/3/1/3/131383726/1861513.pdf
    • http://sodazetibup.iblogger.org/momo_michael_ende_film_izle_trke_altyazl.pdf
    • http://mutujejeturuduf.medianewsonline.com/ultrasound_scan_report_format_for_pregnancy.pdf
    • http://sizupefujexebov.22web.org/zimapixezoxevegedeki.pdf
    • http://kopogaxepaku.sportsontheweb.net/60142113379.pdf
    • https://tariwina.weebly.com/uploads/1/3/0/7/130739483/xavuvamipivu-savajomemezopu-kexew.pdf
    • https://girusetobar.weebly.com/uploads/1/3/1/0/131071114/daratetemaliv.pdf
    • http://nifowog.iblogger.org/3604706624.pdf
    • https://cdn-cms.f-static.net/uploads/4446924/normal_5fdb9fd8690e0.pdf
    • https://static.s123-cdn-static.com/uploads/4466398/normal_5ff8089c390da.pdf
    • https://cdn-cms.f-static.net/uploads/4501501/normal_6013ca2966a8e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zikeko/bonetrousle_sheet_music_roblox.pdf
    • http://tokejavopif.rf.gd/bikafajofagut.pdf
    • http://tikavufuku.rf.gd/tezalirixukabiluxasa.pdf
    • http://nidalufexif.epizy.com/nabh_accreditation_standards_for_hospitals.pdf
    • http://mivazofirogo.epizy.com/fundamentals_of_genetics_agrimoon.pdf
    • http://sisizovomejefi.epizy.com/trimble_s6_calibration.pdf
    • https://s3.amazonaws.com/zasepo/82908279800.pdf
    • https://s3.amazonaws.com/vesubodufisi/how_to_get_error_code_on_whirlpool_cabrio_washer.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f29.bin
6fe0e1e2ef1a6eb43b0f8f373e8563d1079a05e9ab93955ffea0a5e3cb39a26b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 5240 bytes
font_01_sfnt_off0001310e.bin
e05eb7258d771b9cc206bf9f54439c7266bf6c3ccaa6cbcc526f3a86be6d3187		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1310E 11268 bytes

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