Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc870128f01428f…

MALICIOUS

PDF

78.9 KB Created: 2021-03-15 16:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78066ed53ffb7dbc4e3ef8e320f46842 SHA-1: 41315d05c04346576e0724e51acec9ab953cc3ad SHA-256: fcc870128f01428f00b2834aaa6e4fe51cf418a82b310083de798830d43e28c9
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 point to other PDF files, indicating a link farm likely used for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=yabause+apk+android
    • http://fly-drive.online/biganiwedezunh29i3.pdf
    • http://tamasolesodaj.mypressonline.com/jezijononivu.pdf
    • https://bakofusu.weebly.com/uploads/1/3/2/3/132303024/vudewovupuji_ruwalidobuw_tixenuj_kamob.pdf
    • https://kuwovewifinux.weebly.com/uploads/1/3/0/7/130775990/6f1a2329c3.pdf
    • https://girosunemakafe.weebly.com/uploads/1/3/0/7/130739351/kovalofodokudit_ximidakuk_worodalirowubet_zigevaxu.pdf
    • http://palikexifumalam.mywebcommunity.org/how_to_tone_up_your_abs.pdf
    • http://apsmall.space/rejepeness5w.pdf
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/ruzefuvu.pdf
    • http://zisezamerares.mygamesonline.org/wassce_elective_mathematics_syllabus.pdf
    • http://xtrading.buzz/lymphatic_systemdc4n2.pdf
    • http://mobufuwiwid.medianewsonline.com/bow_tie_pasta_and_sausage.pdf
    • http://yabause.org/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rosevasejila.myartsonline.com/wikuguwuvamogivebebif.pdf
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_9f6ee720b702408dadf2ee702635ccb6.pdf?index=true
    • http://pigutun.myartsonline.com/59487984131.pdf
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_5331815c145247518e876e771c700298.pdf?index=true
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_f5ba48a9467442cba62bb7bfa46630d3.pdf?index=true
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_28280bc231754667a666fdaf9a928812.pdf?index=true
    • http://sebokegekesuded.atwebpages.com/56704518916.pdf
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_fa0c0fbba7ea48cbb430d90ae357c608.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda0.bin
eec2311198495a4bc353016469730966835d49679daeed18a98faa9ab15954d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 2828 bytes
font_01_sfnt_off0000f7aa.bin
a5ae0f3b0d76384ddf57b2082b42bc64d8f55eba3f1c841339674bc6f2905da5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 5084 bytes
font_02_sfnt_off000108f6.bin
5007f6e5a6701c59f73c06a9e4acd9122e022a69b22d027e6ad0079ebdc84d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 10876 bytes

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