Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b4ac198551a0d4…

MALICIOUS

PDF

87.3 KB Created: 2021-05-15 04:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 677d1c91c328f48e1ca6d20b2c0c4576 SHA-1: 726661c3c43579521483fa524bbdff0a3adab825 SHA-256: 37b4ac198551a0d4080ce48b74431775c5f2292772ef69759bb7dbd52ea5e741
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a malicious intent related to link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/strik?utm_term=the+seven+basic+plots+amazon
    • https://dirizosak.weebly.com/uploads/1/3/4/5/134509825/xezowilowime_jotufidevore_loburob.pdf
    • https://genopajixon.weebly.com/uploads/1/3/1/4/131452954/roletifoka.pdf
    • https://cdn-cms.f-static.net/uploads/4381529/normal_60692ce4a7237.pdf
    • https://cdn.sqhk.co/wirujurumugi/cgfvggf/funny_sounds_app_for_iphone.pdf
    • http://straponartist.com/kitchenaid_6-qt_575_watt_glass_bowl_lift_stand_mixer84khe.pdf
    • https://cdn.sqhk.co/nurijodefa/bvTe1ih/simosujaf.pdf
    • https://cdn-cms.f-static.net/uploads/4501057/normal_5fd79cd26a243.pdf
    • http://trenolgia.buzz/10271806748h4tm5.pdf
    • http://idealslim-ordina.site/14543104512k33fv.pdf
    • https://murarukaxew.weebly.com/uploads/1/3/4/6/134666391/dorowavizew.pdf
    • http://mavixepajifulem.scienceontheweb.net/temexegipip.pdf
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5fe42309cf62d.pdf
    • http://hookup753.fun/desob2slmu.pdf
    • https://cdn.sqhk.co/tunuviju/hh43kgc/shadow_fight_full_movie.pdf
    • https://static.s123-cdn-static.com/uploads/4374379/normal_5ffefd4551c80.pdf
    • https://lodobapidadisu.weebly.com/uploads/1/3/1/1/131164557/zivofifolodekel.pdf
    • https://cdn.sqhk.co/fabunavaxa/hjCMbic/kexamilosesenixuguxe.pdf
    • http://wobafobigo.mywebcommunity.org/algorithm_design_techniques_narasimha.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b48792d2-5fc7-46ba-97c8-622318d19b08/is_a_weight_watchers_scale_accurate.pdf
    • https://uploads.strikinglycdn.com/files/96fe79b5-6231-4b5b-b411-b4d27a4aa336/48014197722.pdf
    • https://uploads.strikinglycdn.com/files/691b3ce8-05fa-4588-ab84-067120af7deb/bubugu.pdf
    • https://uploads.strikinglycdn.com/files/f66ab61e-df1c-4318-8225-e048f99ccd99/faxonuwux.pdf
    • https://uploads.strikinglycdn.com/files/98ba2910-f215-4b02-9c99-e47eb81e3fb6/dell_u2415_monitor_ports.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_off00011816.bin
b97ac75e1ecfbf7ecc6dec88e873acd9270f49fa5c781a295f77f2c213fd4bd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11816 5276 bytes
font_01_sfnt_off000129ee.bin
bc8c405615a1bc2563ca17195d03bb25a47b71c36409697a96f305964a292548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 11132 bytes

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