Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f5c310fbb9ee8a…

MALICIOUS

PDF

72.3 KB Created: 2021-02-23 02:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 305b89c5b17a3b3faa79b4659843ede7 SHA-1: 389851f391e056756504fa4087dd801198d345d2 SHA-256: 78f5c310fbb9ee8a03eaa32c6c195d7af6dd7effeeb0fc61fee858f030f7c3c4
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 designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to malicious content.

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://leonvi.ru/strik?utm_term=army+white+paper+regulation PDF link annotation
    • http://fakts.design/agnes_monica_sebuah_rasa_mp4ohs7l.pdfIn PDF document text
    • http://boldly-grow.com/solitaire_ai_factory_apka9sxp.pdfIn PDF document text
    • https://cdn.sqhk.co/voxoduvi/KXmjaGP/xekomirofiwikuzurotusuwez.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/fji4Wk8/new_york_city_fc_jobs.pdfIn PDF document text
    • http://zinuginevero.22web.org/xedekuguwabugeka.pdfIn PDF document text
    • http://disconto50.pro/best_basketball_games_for_android_2018h2irn.pdfIn PDF document text
    • http://dobomasinuraz.iblogger.org/aha_2018_lipid_guidelines_ppt.pdfIn PDF document text
    • https://bojuwakuxejekur.weebly.com/uploads/1/3/5/3/135347713/defebidewaker-megapubese-tomesude.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/Ijbiijb/zufopowibebawevula.pdfIn PDF document text
    • http://gadifurewurol.22web.org/bollywood_audio_songs_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/rotexopapi/fZibgjg/fogozalijupes.pdfIn PDF document text
    • http://edalovert.xyz/95077197200fxjnq.pdfIn PDF document text
    • https://waxosutuj.weebly.com/uploads/1/3/1/4/131437699/4343279.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
    • http://winupenelipumo.epizy.com/7731984806.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/75725829917.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/personal_branding_powerpoint_template.pdfIn PDF document text
    • http://fofeparulofiz.rf.gd/sifuzura.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_off0000d1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E2 5120 bytes
SHA-256: 2a418ae787ce002032b7ac3ae4600bab65a521945a3b15adea79b01cc70973c4
font_01_sfnt_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 10216 bytes
SHA-256: e3b0fb05a3f6b6d2a43c58f844048947ab1ba2420673cee855861439d8149b16
font_02_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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