Malicious PDF — malware analysis report

Static analysis result for SHA-256 501f51293b9695fc…

MALICIOUS

PDF

87.9 KB Created: 2021-03-30 11:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3afcaccc98bd670cc2ee5fd8efec340c SHA-1: 5b4263ab7961c506dc2870abb237635683d0621c SHA-256: 501f51293b9695fccaab216772745beb758dcf828f47fb7d8ed7cf4d94e406cf
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/award?keyword=hernia+de+disco+toracica+pdf PDF link annotation
    • http://podarokinsta24.online/68058656049g8jr2.pdfIn PDF document text
    • https://likobikumenaf.weebly.com/uploads/1/3/5/9/135961418/e5aad5bb.pdfIn PDF document text
    • https://pipamoximiketo.weebly.com/uploads/1/3/0/9/130969724/gedefimixo.pdfIn PDF document text
    • http://lnstagram-office.com/549610607378gz2j.pdfIn PDF document text
    • http://muldwych.com/can_you_become_a_mechanical_engineer_onlinejhm5r.pdfIn PDF document text
    • http://reduslimitaly-official.website/84545966527nrpzu.pdfIn PDF document text
    • https://nogalagamepet.weebly.com/uploads/1/3/0/7/130738620/f19132fa162.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/jinus.pdfIn PDF document text
    • http://gachihyper.xyz/jodesarajamirodaxadijusorjbd61.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/togoluwesoligof_liluxowujuwotiv.pdfIn PDF document text
    • https://bufibetotireguk.weebly.com/uploads/1/3/0/7/130739935/niwajapagole-xififipajok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_ec330d5e20dc4cc0b7bc77c94113d2f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fazujo/steinway_boston_baby_grand_piano_price.pdfIn PDF document text
    • http://fuwutowamig.myartsonline.com/different_types_of_drag_in_aircraft.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_ce5e5c4c8a9d4a1f9fffd8dff1ceb3ec.pdf?index=trueIn PDF document text
    • https://b0cee159-9ce3-47d2-9452-de9e383f1b6b.filesusr.com/ugd/fac5c7_ec3b9d452b7946df83646c982c3355b8.pdf?index=trueIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_b40e9e9425a9433995649d8605134b07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/error_code_11_rinnai.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_b3f4e0af6634429b989584ca9ed2f02e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/vikizobafugekigowal.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/22382432349.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/how_long_does_the_play_macbeth_last.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_off00011850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 5076 bytes
SHA-256: d9600bf49f8c5f64eb90a223c9fffd74b20b5cb487fec5f10801a4d119bab47f
font_01_sfnt_off000129a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A4 12156 bytes
SHA-256: bcc676de38590c62a11fd0781cff5f082ea050afb18d2f2da51e54eb695723f1