Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77adf5eef5c3fc7…

MALICIOUS

PDF

77.5 KB Created: 2021-05-01 19:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e36dcec44cadb43cdc773dcca8dac077 SHA-1: 9651689a341b7d278af0988f50e56031fb041c2a SHA-256: d77adf5eef5c3fc70853c3322be038f9f7f57d5c2c6908d1c6b8614e7b6d309e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text related to job searching, which serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=construction+project+manager+jobs+memphis+tn
    • http://xulubapatoso.scienceontheweb.net/how_to_improve_reading_comprehension_skills_for_adults.pdf
    • http://vikiduxa.mywebcommunity.org/14284047910.pdf
    • http://gidilakapajuke.mywebcommunity.org/latukasaxutavibigegufuma.pdf
    • http://saduzemed.mypressonline.com/voxafipavumipowikixe.pdf
    • https://jepololazatozuj.weebly.com/uploads/1/3/4/6/134601538/lozipudixad.pdf
    • http://sakaxek.mygamesonline.org/aims_and_objectives_of_primary_education.pdf
    • https://loxutagunepolu.weebly.com/uploads/1/3/4/7/134763456/4812439.pdf
    • http://linavaluviriv.getenjoyment.net/macbeth_shakespeare_modern_english.pdf
    • http://xolokukifimiv.sportsontheweb.net/zujutajulurubabexukipenu.pdf
    • http://mareson.getenjoyment.net/27628354285.pdf
    • http://bopugafuwu.scienceontheweb.net/70984895996.pdf
    • https://dolujutizividev.weebly.com/uploads/1/3/4/8/134864897/gexinokenajeres_bemapepemu_jujukugusexej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_ead9746965f5428081920bf11a2efd71.pdf?index=true
    • http://sojufuka.atwebpages.com/google_mapreduce_paper.pdf
    • http://rulukufijozijud.rf.gd/31760378132.pdf
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_596323b806574be8b1ca71a79b0ce106.pdf?index=true
    • http://jeduzoli.rf.gd/numujudog.pdf
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_f5329b8c2ec041ca87030f48c1fad6f5.pdf?index=true
    • http://pimorem.epizy.com/jokufazozejugi.pdf
    • https://dce09894-55e7-49e1-9c43-b94069c58f23.filesusr.com/ugd/11ae40_9bec0b012caf4aba98c978a6d155d007.pdf?index=true
    • http://bagusubeleduva.rf.gd/shark_rotator_powered_lift-away_speed_upright_vacuum_nv680_filters.pdf
    • http://putunoxixowelo.atwebpages.com/taditagitititibefag.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_off0000f10a.bin
83b703173bb80359237f6b0448f51ca3fb477fe22d578778c0240ab699821f34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 5436 bytes
font_01_sfnt_off00010358.bin
afd637d1525835ad5245a0aa0f8ca98476f28e6960b0814bb38cf19823c73f01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 10892 bytes

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