Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a915138b20e8617…

MALICIOUS

PDF

84.3 KB Created: 2021-03-28 07:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fe6f65a2ec90b37f767883d5b329a28d SHA-1: 1bb2fd535cc281657c2bb42822e02624383677c7 SHA-256: 1a915138b20e861771e7701cd0144afbed91df6f88c3b7856567d08db4d2939f
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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/123?utm_term=toefl+listening+practice+test+free++pdf PDF link annotation
    • https://tuvepovuno.weebly.com/uploads/1/3/3/9/133997374/02ca1.pdfIn PDF document text
    • https://pumavamevimi.weebly.com/uploads/1/3/5/3/135391045/4034686.pdfIn PDF document text
    • http://kkkirrreeee.space/ice_cream_maker_summer_functionbh57l.pdfIn PDF document text
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/zuvazuvetode_kokasukokazu_timipukadotexur.pdfIn PDF document text
    • https://satiragekawojiw.weebly.com/uploads/1/3/2/7/132740750/puramujadotezek.pdfIn PDF document text
    • https://pesulomerusetus.weebly.com/uploads/1/3/4/1/134109359/gudolir-nibugumirule-govisosevaka-kilevibogubet.pdfIn PDF document text
    • https://terenedadobi.weebly.com/uploads/1/3/5/9/135961601/c8a2ab6a59e326.pdfIn PDF document text
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/c4cb8dfda8c70.pdfIn PDF document text
    • http://buytoday.cc/world_map_with_latitude_and_longitude_lines_and_time_zonesduuf6.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/5533298009467y11.pdfIn PDF document text
    • https://rifuxegu.weebly.com/uploads/1/3/4/5/134525143/ed05ce178d.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://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_06041427501e49aaa0af12552e15725b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/54871572851.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/nefotitonelupasaxubavuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d01161-99ae-499f-a207-a1fb6c0bd775/79131237220.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_0545359a8bb341da83ed3cf3d4efc4f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eaa01a8-7b5f-4d2c-afc8-4a67e8aa1155/95498634445.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_28839cfb8361436fafd4cde417c5953b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/kawixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea4b992-c674-4962-bf29-a442ca31c07b/xagaxonurupubefasi.pdfIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_a1809a7f3ebb406fbd775568eb32864e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/baby_kissing_photos_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc816523-d7d7-46c6-99d8-6b702cc4b6a6/how_hard_is_the_asq_green_belt_exam.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_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 5060 bytes
SHA-256: 4344d220bbe18c4f4f1e62dd4957e60651f116465842662df24a85f5975f9539
font_01_sfnt_off00010e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 10864 bytes
SHA-256: a9df15ce716089cf8ff1bba6328d0a0d0efa0b9703cca9f2b71b0a7fa87b9405
font_02_sfnt_off00013320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13320 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e