Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fa40caceaa8329…

MALICIOUS

PDF

75.5 KB Created: 2021-03-15 17:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1d05ee64dc1ccad901fd1dcf85edabcc SHA-1: dbcec17c985275d60a29c5673be24d5ad7e90001 SHA-256: 91fa40caceaa8329f9630e59f75be2e558dc3e3fe6fedead35a1de1d59fbd8ca
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm. The primary URL, https://maypoin.ru/award?keyword=lactic+acid+bacteria+serum+pdf, appears to be a lure for further malicious activity or phishing. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://maypoin.ru/award?keyword=lactic+acid+bacteria+serum+pdf PDF link annotation
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/kovip_gopofu.pdfIn PDF document text
    • https://bajiwiga.weebly.com/uploads/1/3/1/3/131379875/8a7e940a4ca28.pdfIn PDF document text
    • http://datingdate.site/83806340573auqi9.pdfIn PDF document text
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/vosogikexikotiwimefu.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/baxasujoxof_toxuj_fegotetalapun.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/340380236.pdfIn PDF document text
    • http://ergors.space/youtube_percy_jackson_and_the_lightning_thief_audiobook_chapter_87sfgh.pdfIn PDF document text
    • https://vinatazuxazeki.weebly.com/uploads/1/3/4/6/134641263/6961944.pdfIn PDF document text
    • http://zozuwax.66ghz.com/circuito_productivo_de_la_leche_informacion.pdfIn PDF document text
    • https://gutoxokotuvil.weebly.com/uploads/1/3/1/3/131380594/1179186.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_27da525b49244f6d87a02eb4e058f0b1.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_6a50ac229ce546ac82a97457b0262e37.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_ca7654535838443d862309eed9f3cd7c.pdf?index=trueIn PDF document text
    • http://kujujigufa.epizy.com/how_to_differentiate_between_viral_and_bacterial_sinus_infection.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_a4ce47d3b6f04e73958613b491ff7f67.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizoli/bose_qc35_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/real_gangster_crime_game_app.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/88072944660.pdfIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_01bfa1e60281489e9f0a93ace745e722.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvarelo/beamng_drive_game_free_no.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/astro_compass_manual.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_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 5348 bytes
SHA-256: 4f541c0835285bce99486adc2d9853113cdf808828890f3ba72843aa13c64451
font_01_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 11248 bytes
SHA-256: fb9b33e7a88b9ceea7051546681792220d3fc47f60bb91f2bf6bbef3677fd9fc