Malicious PDF — malware analysis report

Static analysis result for SHA-256 481708f6a15d0dc3…

MALICIOUS

PDF

91.7 KB Created: 2021-04-02 20:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a174f010c59d6e7b8b4865d12db93aa SHA-1: 1052269cd2485d154fc99a23d22bdc624fb2f450 SHA-256: 481708f6a15d0dc34ccef2414145c7ee7aa107525c61affa10d064ba6498b652
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one specifically pointing to a URL that appears to be part of a link farm designed to manipulate search engine results. The presence of numerous S3 bucket URLs suggests an attempt to host malicious content or redirect users to malicious sites. The ClamAV detection further solidifies its malicious classification.

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://ponafet.ru/award?keyword=be+used+to+grammar+exercises+pdf
    • http://madawuboso.sportsontheweb.net/dibujulakaki.pdf
    • http://nosotedidapozal.22web.org/kogupotuzokabexususidiwuk.pdf
    • http://lifolibi.sportsontheweb.net/arithmetic_geometric_sequence.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vanatul/xokumexuli.pdf
    • https://s3.amazonaws.com/dusined/35482829917.pdf
    • http://gupizamowakop.myartsonline.com/8446674557.pdf
    • https://s3.amazonaws.com/kuboki/73428144573.pdf
    • https://s3.amazonaws.com/robumuduluwise/15126869087.pdf
    • https://s3.amazonaws.com/wolina/faxuga.pdf
    • http://gedilemusotatem.rf.gd/bodopizomo.pdf
    • https://8df9d1b7-8f6e-49e1-bdac-c9da4d4291fd.filesusr.com/ugd/12c198_01dc60f1ae7941708ca1fabf108f0988.pdf?index=true
    • https://s3.amazonaws.com/mixanaz/octopus_pubg_lite_hack_apk.pdf
    • https://s3.amazonaws.com/palikuvexake/niguw.pdf
    • https://s3.amazonaws.com/vufuzewasi/nefopinoxitefufoweb.pdf
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_38fbd6e858604df599b011595fb3cd6b.pdf?index=true
    • http://kofufinaniba.rf.gd/95994021775.pdf
    • https://s3.amazonaws.com/wamatasamegu/decision_matrix_template_for_vendor_selection.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001174e.bin
339c7b807117bbbed4adbb6b89b565ea5363d87eaa4bed0e5f868cb26e4e9d51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1174E 5336 bytes
font_01_sfnt_off00012988.bin
20037d1b016ae7eb278550c62ac9bba2224fb11a939c21cecb963f5c8701ace3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12988 12416 bytes
font_02_sfnt_off000153bd.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153BD 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.