Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f277e1575789f05…

MALICIOUS

PDF

77.9 KB Created: 2021-04-06 01:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3f1d9df20afe1a23c220407e3b8fab63 SHA-1: b3a1a29fedd161cbf2bed7b35c32a6f6b7fff02e SHA-256: 8f277e1575789f05e2df1a8bace298a577661e6cee58c1771d398b224c97e60d
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one specifically identified as a potential phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://midufefew.ru/strik?utm_term=how+to+control+jlab+earbuds PDF link annotation
    • http://wisitens.online/molecular_genetics_and_metabolism_reports_issnesqkx.pdfIn PDF document text
    • http://fulifubajamo.mywebcommunity.org/calculo_de_cuadro_de_cargas_electricas.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/H2Hhhij/bose_color_link_hard_reset.pdfIn PDF document text
    • https://cdn.sqhk.co/nepusoliweda/Wjh7jhH/timerifububuro.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/jihihgG/jonuvotululuz.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/rufug.pdfIn PDF document text
    • https://cdn.sqhk.co/garisuvonuk/xjbvhe9/99270280797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_6052c45b6d246.pdfIn PDF document text
    • http://powerpoint4you.ru/nofinifogujoxidlj0x5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_602fa5010cd93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufijimo.rf.gd/24955437132.pdfIn PDF document text
    • http://bovuzigaratufob.rf.gd/57383677674.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/action_full_version_cracked.pdfIn PDF document text
    • http://tibakofe.epizy.com/papa_s_burgeria_apk_1._1._2.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/basic_c_programs_asked_in_interview_with_answers.pdfIn PDF document text
    • http://boxugajot.rf.gd/sri_basavalinga_avadhoota_audio_songs.pdfIn PDF document text
    • http://xisomusexiz.rf.gd/27557034844.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/56708761091.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/bismillah_6.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 5200 bytes
SHA-256: bb01291755b3cfd673820dad69013947b997f1f9dbddc57400380fe6d2b35b38
font_01_sfnt_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 10996 bytes
SHA-256: babbd77ac4517347a4684edc56e8bc6aad459ddb4524fefc1fb4f2a6d09a35f9
font_02_sfnt_off000114e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E9 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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