Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb65a3e95b681254…

MALICIOUS

PDF

87.0 KB Created: 2021-04-02 20:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fccdaea61e2d1e1b395f6fcfdb26aa7f SHA-1: 0eab4528a2b98132d5f1586900066790c67e29a6 SHA-256: fb65a3e95b681254188a7e119bb507b2c2b3a7b1fd4c74e9c8b2ce46f1d878a6
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are associated with link farms, indicating a phishing or malware distribution attempt. The presence of the 'Android phone dialer app missing' string in the document body, combined with the external URI pointing to a similar theme, strongly suggests a lure for malicious content. The ClamAV detection and ML classifier further confirm the malicious nature of the file.

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://nipisod.ru/123?utm_term=android+phone+dialer+app+missing
    • http://goligofalu.medianewsonline.com/vobizomuvokuripujuviriwek.pdf
    • http://zodoworusa.22web.org/66443171340.pdf
    • http://bivozebavi.iblogger.org/public_relations_strategies_and_tactics_download.pdf
    • http://latofolakop.22web.org/pabolerasujogetaradulabi.pdf
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5fc63bec24414.pdf
    • http://potozafit.medianewsonline.com/negukatelasobemepowisutev.pdf
    • https://static.s123-cdn-static.com/uploads/4378604/normal_6009503639993.pdf
    • http://tejidirexe.mywebcommunity.org/7016404623.pdf
    • http://vazifesi.iblogger.org/18748167882.pdf
    • http://mopowataxix.medianewsonline.com/arcsoft_showbiz_5_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4468571/normal_6052cbf4513cd.pdf
    • http://kisuvok.scienceontheweb.net/entrepreneurship_development_course_material.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rezugekolaba/luwukidadix.pdf
    • http://baxovebiw.rf.gd/virus_y_bacterias_resumen.pdf
    • http://judiserod.onlinewebshop.net/action_verbs_worksheet.pdf
    • https://s3.amazonaws.com/diwitapezu/dopewamulo.pdf
    • http://ratobewiwigu.atwebpages.com/1312166471.pdf
    • http://nesuvumuvugelo.epizy.com/99215099871.pdf
    • http://loxupobupibim.atwebpages.com/algebra_1_textbook_pearson.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_off00011598.bin
da24fa1d9d5d902d1594f776d0315320a9a3dd5298020fe29e83c3097ad758a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 5360 bytes
font_01_sfnt_off000127ac.bin
9f64ee21ea02dad7ae79fc3f8f6056e6a0095675e3399da407bb017ffe35aa6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 11532 bytes

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