Malicious PDF — malware analysis report

Static analysis result for SHA-256 d996c340c8ab89c0…

MALICIOUS

PDF

76.3 KB Created: 2021-03-10 15:33:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 545db4df786febca4151374f4814d137 SHA-1: da34261bd3feb727856f52e0d22be1d51a1c7701 SHA-256: d996c340c8ab89c0d34689647cebc46f7d2286305c3d4567b9a87b60786a16d8
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/award?keyword=cherub+brigands+mc+pdf PDF link annotation
    • http://nozatisesufi.scienceontheweb.net/9276425630.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/weighmax_digital_scale_manual.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/31968659504.pdfIn PDF document text
    • http://rarojuso.22web.org/brgschaft_miete.pdfIn PDF document text
    • http://botefin.medianewsonline.com/woodcock_anarchism.pdfIn PDF document text
    • https://fabapetabi.weebly.com/uploads/1/3/4/6/134687037/monefulab.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/peraxijivomixewifaz.pdfIn PDF document text
    • http://niwizonoleror.mywebcommunity.org/gozeruriwibozekezusin.pdfIn PDF document text
    • https://pizijejubuga.weebly.com/uploads/1/3/4/8/134883891/663071.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/wopari/liziw.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/samsung_grand_prime_bypass_google_account_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/81938176745.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/badger_500_garbage_disposal_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/fokawadobox.pdfIn PDF document text
    • http://demajipo.rf.gd/74853527182.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/16296396219.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/zavafimazewo.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_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 5584 bytes
SHA-256: b010ae1fc2828c94b52888f11307ff3930948911bf73c684692b64257bbf5e65
font_01_sfnt_off0001016e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 10304 bytes
SHA-256: b050ecc3d77dd883650ee0f21eba99c86660a11417a7d2d1fc261a0c7f484f0f

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