Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26b3a4d7c73d760…

MALICIOUS

PDF

80.1 KB Created: 2021-04-27 01:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 91e18a618df964f4b9fcffee40f60a5e SHA-1: 0546d8e64af8bfc5f1f645e76ae9311af569dbac SHA-256: c26b3a4d7c73d760e8fdf9839f11b81d832a46dabf29c6c2d53bb36c6d1f2f27
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL suggesting a sales listing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the sample is part of a link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/strik?utm_term=mf+35x+for+sale+uk PDF link annotation
    • http://lorewipa.scienceontheweb.net/cva_wolf_209_magnum_break_action_.50.pdfIn PDF document text
    • https://ridewavovelomu.weebly.com/uploads/1/3/4/6/134697160/717440.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/rajesh_cherthala_flute_video_songs.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/libros_sobre_la_contaminacion_del_aire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370284/normal_6049c9d1eed89.pdfIn PDF document text
    • http://wigevopane.iblogger.org/77975203639.pdfIn PDF document text
    • http://bukipumil.mypressonline.com/lalomafaguli.pdfIn PDF document text
    • http://gibelepij.scienceontheweb.net/25430662298.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/xerisiner.pdfIn PDF document text
    • https://joxukitemubat.weebly.com/uploads/1/3/5/9/135957717/kukozesasorel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418993/normal_6041fca414216.pdfIn PDF document text
    • https://tesegape.weebly.com/uploads/1/3/5/3/135387632/5127399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_604823947dccd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://padegijogul.atwebpages.com/why_does_my_dyson_keep_flashing_blue.pdfIn PDF document text
    • http://wifesonejeduva.epizy.com/74299775306.pdfIn PDF document text
    • http://vejegaba.atwebpages.com/whirlpool_cabrio_dryer_manual.pdfIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_2208f175c30c4956901e6ec009a13839.pdf?index=trueIn PDF document text
    • http://lojibovel.myartsonline.com/58076389621.pdfIn PDF document text
    • http://donufuruwitij.atwebpages.com/naxiwibikofolevovitarinov.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_5baff94363fc4a83b12fe3e316103bb8.pdf?index=trueIn PDF document text
    • http://gimobomir.epizy.com/70258063100.pdfIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_7e8148fff61546b998c808142d49376a.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_9d630efe435a40649ee3d1455ac0596b.pdf?index=trueIn 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_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 5184 bytes
SHA-256: ef7fcb2ffaf75f3b037dfa662dacbe2a84fab27818262b91ff7567ed2653c50f
font_01_sfnt_off00010ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 11216 bytes
SHA-256: 10b432af56539f3de1f12f4626ad64f55246fa3365e256159569152e84047d40

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