Malicious PDF — malware analysis report

Static analysis result for SHA-256 13af0a0047902951…

MALICIOUS

PDF

71.7 KB Created: 2021-03-29 16:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a6ef9083a801af5316be017618df453a SHA-1: ba33671cf2616177cc65378e5be087051a693f76 SHA-256: 13af0a004790295137dc331efa95e0ea610cc8985a7c20328a440fb32f5365d7
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a PDF link farm. It contains numerous external URLs, with the primary suspicious URL being https://ponafet.ru/award?keyword=basic+english+grammar+module+pdf. The PDF structure and embedded content suggest it's designed to redirect users to a large number of other PDF documents, potentially for SEO manipulation or to distribute further malicious content.

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://ponafet.ru/award?keyword=basic+english+grammar+module+pdf PDF link annotation
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/1563320.pdfIn PDF document text
    • https://modibabujoxasa.weebly.com/uploads/1/3/4/6/134694511/5471819.pdfIn PDF document text
    • https://lonitavow.weebly.com/uploads/1/3/4/3/134355974/7867193.pdfIn PDF document text
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/45e1eb.pdfIn PDF document text
    • https://jimedugevebuz.weebly.com/uploads/1/3/4/4/134437071/3d131fdb3768eb.pdfIn PDF document text
    • http://wabesiguz.22web.org/how_to_replace_lid_switch_on_kenmore_stackable_washer.pdfIn PDF document text
    • https://josapepukixo.weebly.com/uploads/1/3/1/3/131384602/561ffa22c6.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/kegovev/54689564275.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/dutupekami.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/zakemelanotufokiwudenupep.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/proform_995_treadmill_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/how_to_write_a_professional_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/how_to_put_bose_speaker_into_pairing_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/what_is_a_marketing_plan_template.pdfIn PDF document text
    • http://putagasixebe.epizy.com/flasher_meme_template.pdfIn PDF document text
    • http://zejowupifodoj.rf.gd/kitchen_tools_worksheet.pdfIn PDF document text
    • http://ranoponadugat.epizy.com/16098220010.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/79644299810.pdfIn PDF document text
    • http://porapasegunan.epizy.com/rent_receipt_template_word_doc.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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 5616 bytes
SHA-256: dc49fbd6587af75de2fee85453d93d220a32c6e260a4845caa75db796c5b2270
font_01_sfnt_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 10904 bytes
SHA-256: daf8bd20ef5c275b0d84664a3c779ebaa9bb92b1a5875129f617a64504307fad

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