Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfc61c898805980…

MALICIOUS

PDF

77.5 KB Created: 2021-03-18 22:46:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5e02cf5ebb173821ae31b1f69e71d8a2 SHA-1: 24af5aa8f6260072987b39c50f5cb5927ee9f840 SHA-256: ddfc61c898805980e30caee7b7bc6e711fab9a575f77e94bd73fefe2a3287eb3
186 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. It functions as a link farm, containing numerous external URIs, including one pointing to `jottigo.ru`. The presence of many links on disposable hosting suggests an attempt to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself is leveraged 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://jottigo.ru/strik?utm_term=toro+snow+thrower+parts+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455902/normal_60122501cdd80.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/nupawemi-jirekofoviwa-nalupilavosezod-gotemoduje.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/83198082095.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/91388783419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486060/normal_60497e2daba6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470833/normal_6031eefe44db1.pdfIn PDF document text
    • https://lixawedubofalat.weebly.com/uploads/1/3/1/4/131407760/2178076.pdfIn PDF document text
    • https://vedixoba.weebly.com/uploads/1/3/4/8/134864822/aa83aa53c47.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/rivugade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453329/normal_604460ed552a6.pdfIn PDF document text
    • https://mibubibot.weebly.com/uploads/1/3/1/8/131871690/lamivib_zuvex.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://uploads.strikinglycdn.com/files/986366c6-6523-449f-ae5d-bc930f2db3f4/290493083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ef62a6-8672-4903-ba1a-66c3a8e991dc/gefozamibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a8eb88-ca87-4238-a2f0-0ad383660ccc/freightliner_cascadia_stereo_wiring_diagram.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_a3979ad147c8434bb2fb4230a1b47081.pdf?index=trueIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_31b2d01b50b24860b38d649f910db51a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/82051702923.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_37914d3236554c9db8653e69baf40916.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e4c458-0597-4bd1-8176-6fc942aa34ea/93765834565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e99af2e-b395-460f-840a-bd243ade664a/rezugezepizuta.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/genie_pro_screw_drive_sensor_wiring_diagram.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 4808 bytes
SHA-256: df48961e775b9af55d8d9763d25b08d9e010c69c4f87fc286518ad3372760af8
font_01_sfnt_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 10372 bytes
SHA-256: 4f030cd5e657edaeb428a9cdd0b96ccd12a7621c14561add625c9582d07000a7
font_02_sfnt_off00011a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34