Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd2c74677c0f5bb…

MALICIOUS

PDF

74.6 KB Created: 2021-04-02 23:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4e66cc3fd5efbf2dd8aa9ae97f7ec18 SHA-1: 97b722247ce2b9eb801e4be7f098ca9b0b06a67b SHA-256: dfd2c74677c0f5bbddab640f157db097de490608b0ca8e232a318eb05be99e2c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-optimized PDF files, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=rift+forum+warrior+guide
    • https://bidopafogusiw.weebly.com/uploads/1/3/1/0/131070115/fisujaloso_paribuvile_bebodoge_pakuvufatez.pdf
    • https://temegefa.weebly.com/uploads/1/3/4/5/134583031/toramum.pdf
    • http://metazoaapc.fun/71510729293il4n9.pdf
    • https://kilixezexixoz.weebly.com/uploads/1/3/1/1/131163494/nevos.pdf
    • http://vegifeda.mypressonline.com/deleganole.pdf
    • http://porn77.design/laser_treatment_for_cervical_cancer687wa.pdf
    • https://xotukejurivaj.weebly.com/uploads/1/3/4/0/134016857/8491595.pdf
    • http://detonicinitalia.website/wexubon6rhri.pdf
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/nadoxuvogefaf-pivugufufodive-sorajose.pdf
    • https://bemagage.weebly.com/uploads/1/3/4/5/134525224/7392304.pdf
    • http://burrrhey.tech/rosemount_3051_dp_transmitter_accuracys8dbo.pdf
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/9947164.pdf
    • https://dajedenutiwifux.weebly.com/uploads/1/3/4/3/134318988/zenidubodaladanuni.pdf
    • https://befawiboper.weebly.com/uploads/1/3/5/3/135389238/3063168.pdf
    • https://jejaxome.weebly.com/uploads/1/3/4/4/134443668/2366819.pdf
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/wigowemoxadeta-nepid-fujegu-wosorufifa.pdf
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/jiresetadupenatu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/18ad1c53-d286-477e-b3e0-5d0a227ecf7b/kejikur.pdf
    • https://uploads.strikinglycdn.com/files/c0cda3d2-c7d9-429f-990b-55eba0057eca/cateye_micro_wireless_setting_wheel_size.pdf
    • http://zonafikepejese.onlinewebshop.net/relim.pdf
    • https://uploads.strikinglycdn.com/files/32cca4fd-2298-4e4b-a7e9-f005b7c0d0a8/are_boy_scout_popcorn_tins_recyclable.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_off0000e5fb.bin
525fbf9599f99cd1d089da54e3c787cb691f79a70e084ef99ae531ccb8895b44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 5116 bytes
font_01_sfnt_off0000f762.bin
f9023ae149d75c8bbcc02cc5a9b55a64b99091177e60c1cb6017830ffc395f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 11376 bytes

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