Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a57105fe859ca20…

MALICIOUS

PDF

83.3 KB Created: 2021-03-31 08:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 53d4dfd2974be4012ce760edfd5e3bf4 SHA-1: d57dea5ab55f2ee5f90060b7aed342e5f6536266 SHA-256: 5a57105fe859ca209a43b3d64b29fcdc0e29c5b202045bc04b008de4f2548f1f
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains keywords related to product pricing and file downloads, reinforcing the lure. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=onkyo+tx-nr616+price PDF link annotation
    • http://nuvotana.22web.org/hush_little_baby_lullaby_mp3_download.pdfIn PDF document text
    • http://satijafi.22web.org/ethiopian_grade_9_biology_student_textbook_download.pdfIn PDF document text
    • http://rutefozur.22web.org/bugajepipibesomalinuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450351/normal_601bb95760f94.pdfIn PDF document text
    • http://xokodiraki.22web.org/probably_approximately_correct_valiant.pdfIn PDF document text
    • http://mupixejida.22web.org/guided_reading_activity_5-_3.pdfIn PDF document text
    • http://malafasa.iblogger.org/safety_movie_true_story_where_are_they_now.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_600c2750d90ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/irganox_1098_technical_data_sheet.pdfIn PDF document text
    • http://vuzogumav.rf.gd/jodigufixitupibotapo.pdfIn PDF document text
    • http://pavefobigemaxe.rf.gd/88388739628.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_e90e55213dea42a2833d04d56d33d749.pdf?index=trueIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_fc4eca06ef6d4fa58be7b0fadd94d710.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_f41612a2cf0b4631b77843c8b4399a4c.pdf?index=trueIn PDF document text
    • http://dadokupokumudav.rf.gd/wofipiwisibizukuxegugumud.pdfIn PDF document text
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_7d076afcd1bb476bbfd6228c04d9f41d.pdf?index=trueIn PDF document text
    • http://ramawotinejog.epizy.com/satavakerasojuniboduresu.pdfIn PDF document text
    • http://nuvavevuk.rf.gd/scottish_mythology.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/funirurenab.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/evenflo_securekid_platinum_review.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_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 5004 bytes
SHA-256: 430f49fa7447a4fc175a48047c1a89ccb16dccd43b3cfd5ef3e85cfdf66e3e85
font_01_sfnt_off00011b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 10792 bytes
SHA-256: 9e23d5c6d2b0ba8f22fb67cd3929bb2497d6fd28b485ef5ae6cb795e828bfb6c

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