Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d2b3e00b63657c…

MALICIOUS

PDF

89.5 KB Created: 2021-03-29 11:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 861145b4726639bb2494d166b99f4b7f SHA-1: 8a3629b6582d5a0ecca2c2b8c1b0b5f11d374729 SHA-256: 13d2b3e00b63657c69ef1d654cc3e23651cd1b4f0e1c5a20518a98946df1452e
246 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous external links, many pointing to disposable hosting, forming a link farm designed to obscure the ultimate destination. The critical heuristic 'SE_BRAND_CREDENTIAL_PHISH' confirms the intent to impersonate a brand for credential harvesting, likely through the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jupolojujilozas.weebly.com/uploads/1/3/4/5/134598947/jokonuxulumo.pdf.
  • 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://leonvi.ru/wix?keyword=project+freelancer+x+male+reader PDF link annotation
    • https://jupolojujilozas.weebly.com/uploads/1/3/4/5/134598947/jokonuxulumo.pdfIn PDF document text
    • https://zemotoru.weebly.com/uploads/1/3/2/6/132695551/bc121c.pdfIn PDF document text
    • http://fitukogamoj.iblogger.org/wuvutojixafalafunikivajo.pdfIn PDF document text
    • https://ropadapolope.weebly.com/uploads/1/3/0/9/130969983/nelalomuxalux.pdfIn PDF document text
    • http://kimidenexikox.getenjoyment.net/past_simple_and_past_continuous_story_exercises.pdfIn PDF document text
    • http://xezixaz.getenjoyment.net/13213014619.pdfIn PDF document text
    • https://nuzotononi.weebly.com/uploads/1/3/4/0/134012627/dovezos-fujujo-komamotuguxemow-talamasomuba.pdfIn PDF document text
    • http://jukejed.mypressonline.com/battleships_game_printable.pdfIn PDF document text
    • https://luzusuzure.weebly.com/uploads/1/3/0/7/130775685/f9581ec8e8753b.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/fe9a7f27fd0105.pdfIn PDF document text
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/jijom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_f745de388473429aa7addb923df01705.pdf?index=trueIn PDF document text
    • http://bibezakomi.myartsonline.com/mathematics_syllabus_d_book.pdfIn PDF document text
    • http://zarazemudaseri.epizy.com/84422417795.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_124016b60fe94afeb6e95b37fa385efb.pdf?index=trueIn PDF document text
    • https://0404cab7-c021-4537-be79-420bcb2f88cc.filesusr.com/ugd/52c240_d9df5e71bd874eaa96cb7ae8389baeac.pdf?index=trueIn PDF document text
    • http://gamojeliziri.rf.gd/48759388830.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/61236159669.pdfIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_0b016078868d4107a8141a4ee2d9bab8.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 7324 bytes
SHA-256: c10c81bb5d79ba2f6c734051c4a7fa74627a8867d708866c434cb52b3a5f1bbe
font_01_sfnt_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 4876 bytes
SHA-256: 5a7254eec0a4909cae1d4db260d111142225a6a057ee494740baa5a62b511027
font_02_sfnt_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 10696 bytes
SHA-256: c81243b91ef2960a2b0b23fa34e7095420a345a836bc06517ccf27532f79a358
font_03_sfnt_off000134cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CC 16148 bytes
SHA-256: 64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b
font_04_sfnt_off000149dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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