Malicious PDF — malware analysis report

Static analysis result for SHA-256 23aec56dcde7734e…

MALICIOUS

PDF

85.2 KB Created: 2021-04-20 22:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9dc11e74bfa3025c691d9a39c2ad066 SHA-1: d7c93deeb95b69713d8446652afcf3b259f8f981 SHA-256: 23aec56dcde7734eb8b9dfe10a76ca60d6306a6cc4ded35ada7af1ece962b325
226 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' indicates the document's content is designed to deceive users, likely related to advance-fee fraud. The presence of embedded URLs and the ML classifier's high score further support its malicious nature, suggesting it's used to drive traffic to potentially malicious or scam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://vilenefex.ru/strik?utm_term=how+to+write+hundredths+as+a+decimal
    • https://lelifomokul.weebly.com/uploads/1/3/4/6/134618459/9577011.pdf
    • https://juzunuxav.weebly.com/uploads/1/3/4/3/134316531/f2a92c4399.pdf
    • http://ziximotizaned.medianewsonline.com/27499400905.pdf
    • https://fijitedutim.weebly.com/uploads/1/3/1/1/131164269/javebosozufa.pdf
    • http://kajipim.mypressonline.com/gokevopizepexekuvefexakip.pdf
    • https://vowopazi.weebly.com/uploads/1/3/4/0/134096587/pufabomesoriwemoje.pdf
    • http://wonizojaru.scienceontheweb.net/8958026022.pdf
    • https://vetaguluxidi.weebly.com/uploads/1/3/4/6/134656260/7e7cf823b97f8.pdf
    • https://bumozirejukije.weebly.com/uploads/1/3/5/3/135340746/xugaloguronizerafar.pdf
    • https://cdn.sqhk.co/wiwuwigo/gy8gijd/miracle_whip_strain.pdf
    • http://zozavelomidabi.scienceontheweb.net/vovexusu.pdf
    • https://cdn.sqhk.co/bofagenined/igShiid/momiwevenitosif.pdf
    • http://biniwitovo.mywebcommunity.org/japanese_woodworking_joinery_book.pdf
    • http://kirudikegopoded.sportsontheweb.net/41479671076.pdf
    • https://wegedojilo.weebly.com/uploads/1/3/1/3/131398291/javizimamisapelida.pdf
    • http://kogutojoveso.mywebcommunity.org/72376215794.pdf
    • https://fanedidunosav.weebly.com/uploads/1/3/5/3/135345804/5440313.pdf
    • http://vaxisezawoged.scienceontheweb.net/definition_of_volcanic_eruption.pdf
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/673275.pdf
    • https://cdn.sqhk.co/vewukiziwemi/nVhieSv/fixing_large_holes_in_plaster_walls.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://buwanizun.epizy.com/canon_eos_rebel_t3i_guide.pdf
    • http://lonesopuw.onlinewebshop.net/6361616181.pdf
    • http://bebezira.epizy.com/how_to_get_your_lexile_score_higher_on_achieve_3000.pdf
    • http://jatoxat.atwebpages.com/kenapanuwagefi.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_off000102fb.bin
277637d76c0775b6738d36e2c21807bc8b0ce74ecea667c8a2c5b5363ff7ac7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 5116 bytes
font_01_sfnt_off00011437.bin
5e991c39ddbe203c5b110479074862e8b4ab4a97d7bbb5b7f9b63a56a69a7596
pdf-font-stream PDF embedded font (sfnt) at offset 0x11437 10864 bytes
font_02_sfnt_off0001391b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1391B 4324 bytes