Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9a6f996fc706cc…

MALICIOUS

PDF

137.6 KB Created: 2021-03-29 03:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6d9f53576e10b88679fcd3e1664930f3 SHA-1: de8e4a8279a5ec081a48b82ce2d318cc10100077 SHA-256: 1e9a6f996fc706cca64882346f9228655cb8abf8b9847265f234796ba09edfe3
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, potentially for further exploitation.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=honeywell+fire+alarm+system+manual+pdf In PDF document text
    • http://drenajkrasnodar.ru/whitney_houston_brandy_cinderella_movieqdjva.pdfIn PDF document text
    • http://fawaxifiwuzodil.scienceontheweb.net/xawepabolilo.pdfIn PDF document text
    • http://walletelectrum.buzz/bloons_td_5_monkey_lane_impoppable_guide95nik.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/MXjhjeH/72890760996.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/gOGUsNv/sticker_by_grace.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/iP9hfjj/cnc_milling_machine_for_home_use.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/ujfDib5/checkers_trading_hours_polokwane.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/tavomo0603l.pdfIn PDF document text
    • http://vijepuwobewi.mygamesonline.org/biochemistry_miesfeld_free_download.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/arthashastra_book_in_marathi_free_download.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_520b93db16b244d0a9de8a113944bec8.pdf?index=trueIn PDF document text
    • https://af8e4364-7f8a-45ec-af3e-d69da1c27fbb.filesusr.com/ugd/12c36c_e8d17334734f4221afc7360d29c4dab6.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_52816ecda4b8456992e89b07b5a42433.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_0d82184f915244258166df2934c064d9.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_24ef1ddfe2c94544bc206e746c13f506.pdf?index=trueIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_592eb72816d14cd6a6a1349670e65c61.pdf?index=trueIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_420a7ce5c8854c00b6e78852ba8228cb.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_5f21cf9e0be24760b2109b67ff02b32d.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D25B 1956 bytes
SHA-256: 211d0de9d646a3ea3ebb87f4119adf1c8ed9c0b1c583f0ecf84f4295d1cec4f4
font_01_sfnt_off0001dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBB1 5344 bytes
SHA-256: 278d160980cd5542478f3ecc0352d656605ae62784e11a1394106368f9caea2c
font_02_sfnt_off0001edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDDE 12644 bytes
SHA-256: 7662a1b23dd6ca5d9e0531b4d48da174e4135d9bca9229949fadcc086903744e

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