Malicious PDF — malware analysis report

Static analysis result for SHA-256 444118eed9c5897d…

MALICIOUS

PDF

69.6 KB Created: 2021-03-12 09:25:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 4a62befeeb837b068369d8b5224408fe SHA-1: 28730b574072867886773045ddc1fca1ddac0ce9 SHA-256: 444118eed9c5897de8761e57ba18dd53da07a7d7e97ad440d512c6bce513752c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with several pointing to suspicious domains and one specifically linked to a 'detailed map of vietnam pdf' keyword, suggesting a lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

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://seumenha.ru/award?keyword=detailed+map+of+vietnam+pdf PDF link annotation
    • http://smartroom.pro/american_standard_furnace_reviews_20188krpg.pdfIn PDF document text
    • http://dhl-order.info/2008_toyota_highlander_hybrid_battery_lifewvfrj.pdfIn PDF document text
    • https://jinokafolamod.weebly.com/uploads/1/3/4/3/134310646/b7a53b4ebbe062a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417123/normal_5feb5fe497a35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452587/normal_60116ed763a41.pdfIn PDF document text
    • https://xofujudafovebe.weebly.com/uploads/1/3/1/4/131410434/fadeligasube.pdfIn PDF document text
    • https://gukilebulasule.weebly.com/uploads/1/3/2/6/132682884/aba9f2214b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483388/normal_5fedfc95afc62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491155/normal_5ff773f761924.pdfIn PDF document text
    • http://de-bewertung-889562.icu/horizon_credit_union_membershipso3kq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452171/normal_604a4b2b31c31.pdfIn PDF document text
    • http://andyhong.blog/bilowajinubenoniledtnkvt.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/new_jobs_in_pak_navy_2020kt7or.pdfIn PDF document text
    • http://xegafutulon.iblogger.org/13587890951.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najovuwovi.rf.gd/free_autocad_blocks_restaurant_furniture.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/fonitezosovexujake.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/nekutivimidomozatimod.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/afterglow_headset_wireless_manual.pdfIn PDF document text
    • http://mefowoweman.epizy.com/alta_via_4.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_off0000d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66C 4972 bytes
SHA-256: 83d950f212b51c375ce50011618114d292ea747553a9bead0ea72303af2ad1f6
font_01_sfnt_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 9892 bytes
SHA-256: 6f89582e6e6177caf7a4c5662017cf38ae1b13f91224665f97b5359a5b16811f

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