Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b2772385d52651…

MALICIOUS

PDF

131.3 KB Created: 2021-03-28 20:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d8521134be03721744c1dd162ebd15fa SHA-1: 75807e1d43dd2b919d2cf2617690ea9bd265dca1 SHA-256: 57b2772385d52651ad362c0badbf499a55eef6fdfd0354db6a65c7ecd774d80b
134 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains text related to 'free cycling app android' and 'wkhtmltopdf', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gimoguvi.ru/123?utm_term=best+free+cycling+app+android PDF link annotation
    • http://benivosefemiza.medianewsonline.com/13463690615.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/ie7ihgj/app_discount_calculator_android_secret.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_600aaa1f723a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464732/normal_603c1a3329312.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/jfiaib0/magic_powers_wiki.pdfIn PDF document text
    • http://sazasebum.iblogger.org/zobineran.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_602bdd8f20b1a.pdfIn PDF document text
    • https://cdn.sqhk.co/lufelumad/iyuOtjf/zosuvefuxuxixav.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/dhdjjie/do_crows_eat_eggs.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/ifwiggc/pitopinab.pdfIn PDF document text
    • http://lazokiwumemo.mygamesonline.org/81698446510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392463/normal_6035e49e3fa34.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/56523283394.pdfIn PDF document text
    • http://pululap.22web.org/antigona_sofocles_millor_fernandes.pdfIn PDF document text
    • http://domuxiwedazov.22web.org/tedexudikipumowatiget.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_45a788740c674e7fa29bcfb6f47c12c5.pdf?index=trueIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_6d6eb6919bd64330a92295a75842afca.pdf?index=trueIn PDF document text
    • http://kigojiki.epizy.com/fiposesawakasuripurowi.pdfIn PDF document text
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_8823e26c6c724869854e9d6d1c75c717.pdf?index=trueIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_194d0634096b49ceb3e0c6430e6d0ad1.pdf?index=trueIn PDF document text
    • https://c039f79f-855f-4b64-8838-30138aeea086.filesusr.com/ugd/6b78cb_aa8b61cb6f8c4a849f31e89314f5ed19.pdf?index=trueIn PDF document text
    • http://seriwod.epizy.com/percy_and_annabeth_sleep_together.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_off0001c67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C67C 5476 bytes
SHA-256: e0e039fe6edccde1e7ceb11dcc7eacd91bd471f532de370ab16d1221bb42714f
font_01_sfnt_off0001d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D93C 11528 bytes
SHA-256: bd9d6025c3dd76b60e3855628e64be0430ec90abe0cec1f507b6ce81d980f5b2

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