Malicious PDF — malware analysis report

Static analysis result for SHA-256 291ef40d80a28dbd…

MALICIOUS

PDF

79.2 KB Created: 2021-04-25 15:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 641cd68bb0985a23a557eba3859ac66e SHA-1: b18371b1c824c031c8377fb4d4dff8be6742ba09 SHA-256: 291ef40d80a28dbd783bf89b9b68e57f6c0e7118074145d337d4a72a763ec21b
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 0.9990

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://botokaw.ru/strik?utm_term=what+lives+in+a+prairie+ecosystem PDF link annotation
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/kabemese-wokot-jususenibok.pdfIn PDF document text
    • http://com-servers.online/16_channel_mixer_price_in_nigeria16ui2.pdfIn PDF document text
    • https://vonosupaxeme.weebly.com/uploads/1/3/0/7/130740497/7917c18117494.pdfIn PDF document text
    • https://namonivet.weebly.com/uploads/1/3/4/4/134493383/sokejuvag.pdfIn PDF document text
    • http://letnesil.xyz/learn_to_read_latin_workbook_answers1mex9.pdfIn PDF document text
    • https://wojawiso.weebly.com/uploads/1/3/0/8/130813991/07cd5549df.pdfIn PDF document text
    • https://lizotolagodega.weebly.com/uploads/1/3/4/4/134495854/vevimesugadiwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/72251f1a-3033-4160-93d9-d16bc34419da/toro_wheel_horse_8-25_belt_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af1e868-a02f-4b22-aca7-b2d9272cf2dd/was_the_us_involved_in_ww2_before_pearl_harbor.pdfIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_7808bc61a5354397b911e20e5765f867.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1ed82c-45d9-4ad3-b7af-80fbc32a9157/32311332042.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/gibuviponuvoxutixawutera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d391d2a-a854-42f8-be5c-ca21d2bcf21f/how_to_use_sears_kenmore_sewing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/deped_item_analysis_template_2019.pdfIn PDF document text
    • https://2b075577-062e-477b-ba44-a680027dca12.filesusr.com/ugd/ee943f_eac39afb4ecd47a5a826f5b776355765.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be44400-5c79-4471-ac75-3d824346d514/23810835068.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_282da8814859448fbb326d99df9346dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/35634083176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b413f7-37ae-4047-a581-89b28784a69d/how_to_change_marathon_wr50m_watch_from_military_time.pdfIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_6a8d957231c64cd1a2d4f7dee0b345c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1497368-a726-4b76-889c-0dc722c17cb7/guvedowudexusufojuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41210c2d-f2db-4f15-8194-c9125c586f49/60113244265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d064430-d2d7-4cc0-bd24-d08b25f837a5/the_crown_cast.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_d34f568147a94693bc8df2ea28f0e4b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7757cdc-b261-49ee-ab21-f3fc7a663351/15906021019.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_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 5348 bytes
SHA-256: f833f2f1e6ca9fb234a6d4e41dd054ab8c3c6aa9ae34764a81dab0c9074fb410
font_01_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 10588 bytes
SHA-256: bd79ea9159876e47c1dd278b22b0a1710cc95fe7f6914dfb60ace0847a07931b