Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f13394a7e84f9f9…

MALICIOUS

PDF

74.4 KB Created: 2021-03-10 21:37:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7237d6aeb6a4e7569cd3bf79d84a9e85 SHA-1: e388efb10bd974739ded2790fd41b59edaacd972 SHA-256: 5f13394a7e84f9f9bf1ab7ec6ddda275e821f3a376f59b808aeaf5eff3ba627c
196 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 PDF files, suggesting a link farm or SEO manipulation tactic. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates the document's content is designed to trick users into believing they are entitled to a prize or funds, requiring them to take further action, such as clicking a link. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=tecnica+zero+g+guide+pro+2017
    • https://lareduna.weebly.com/uploads/1/3/1/4/131453109/04bfef125152.pdf
    • https://resagivet.weebly.com/uploads/1/3/1/3/131383325/mirelebivor_gupexizu_zuruvaxovir.pdf
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/kekewidunufawebuvaxa.pdf
    • http://xusakarezexalu.iblogger.org/fobapusi.pdf
    • https://lareduna.weebly.com/uploads/1/3/1/4/131453109/8380733.pdf
    • https://bawowafakapapo.weebly.com/uploads/1/3/4/0/134042412/sadijixar.pdf
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/2a38c29492.pdf
    • https://derovidexaw.weebly.com/uploads/1/3/1/3/131382126/gesexesum.pdf
    • http://bufaturofonoko.22web.org/35156574240.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/donake/4333603405.pdf
    • https://s3.amazonaws.com/midizaxopazeji/foloruxis.pdf
    • http://bolarerovu.epizy.com/aadhalal_kadhal_seiveer_songs_in_tamiltunes.pdf
    • http://ralenosozizog.epizy.com/kilel.pdf
    • https://s3.amazonaws.com/daraniwekamidir/domain_driven_design_free.pdf
    • http://vizebafep.epizy.com/biochemistry_laboratory.pdf
    • https://s3.amazonaws.com/wokesabisevo/simple_addition_worksheets_for_kindergarten.pdf
    • https://s3.amazonaws.com/musokejixami/how_to_reset_samsung_tablet_sm-t350.pdf
    • https://s3.amazonaws.com/xapijifas/report_incorrect_tax_code.pdf
    • https://s3.amazonaws.com/zuponefi/66180494240.pdf
    • https://s3.amazonaws.com/dazuxujepov/kukojotezoleda.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_off0000e65a.bin
924891a77b76b3da99d7cafa011154a08478d5c6bf7ac20e0e079253bbff4f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 5436 bytes
font_01_sfnt_off0000f8ff.bin
2c25101a385384773a23149ff9501f34ead2ef182336958d3afabb9a46d303a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 10428 bytes

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