Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ab681ed5ebc591…

MALICIOUS

PDF

82.8 KB Created: 2021-04-03 09:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72856e7d2eec5bc307c93d9de664f3ed SHA-1: 7e52be4ef0c473e4301b37abfefc578ea4f67eb1 SHA-256: a5ab681ed5ebc5914151cd382b52dab9cd5553dd47b2e3bdf9607b6d44fc2d1c
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a pretext for hiding malicious content, likely a second-stage payload. While no scripts were explicitly extracted, the PDF structure and embedded links point towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gimoguvi.ru/strik?utm_term=download+linda+costanzo+physiology+pdf
    • https://vejupurujiku.weebly.com/uploads/1/3/1/6/131606174/lilefawogofep_pefekepofof_jabimo_zusox.pdf
    • https://riwipawubo.weebly.com/uploads/1/3/1/4/131453561/9140562.pdf
    • https://jomokojexenubi.weebly.com/uploads/1/3/4/8/134877089/mudebubogif.pdf
    • http://theboldpantsproject.com/everyday_mathematics_grade_2_worksheetszc71b.pdf
    • https://danegatazi.weebly.com/uploads/1/3/0/7/130776269/mofeze.pdf
    • https://fikomepa.weebly.com/uploads/1/3/5/2/135299400/liruvikosegedoxemem.pdf
    • http://qunit.space/selenium_testing_tools_cookbook_-_second_edition_free_downloaddtif2.pdf
    • https://xefanopebowemid.weebly.com/uploads/1/3/2/6/132681782/rizogejamoki.pdf
    • https://lekusimije.weebly.com/uploads/1/3/1/3/131383821/866331.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_6bdb71df001c49aba424aa916d636ee0.pdf?index=true
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_43536be899ba4fa69b1ba87d49478d91.pdf?index=true
    • https://s3.amazonaws.com/jadudusujuje/7641684947.pdf
    • https://s3.amazonaws.com/suxiweke/jofusakezefita.pdf
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_3044452e24cf4d30b1a868475dce2ac3.pdf?index=true
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_143ff04d5f124d418bc96002a11ef078.pdf?index=true
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_2842309d3d9846e485fcdbcc332159a7.pdf?index=true
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_4796c3c818dc41059b7e589b26972f41.pdf?index=true
    • https://s3.amazonaws.com/mexesazaxasa/muwekobit.pdf
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_d9b990c8f4614cf98f0053fb99c83171.pdf?index=true
    • https://s3.amazonaws.com/gifojuxaxeva/42873540145.pdf
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_ad79dc7234b149549f92755221ea5c80.pdf?index=true
    • 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_off0000f52a.bin
f7abbed3ad1521423b4eda62fcea8d0aab8aa0ce97b6493858c9f7b689ed8b0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 5232 bytes
font_01_sfnt_off00010712.bin
dbd45740b83f96710ae508458c060c53de21e1f8e31c2505f1a97c8c5b676a30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 12328 bytes
font_02_sfnt_off00012f9e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9E 4324 bytes

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