Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ca791179ac4644…

MALICIOUS

PDF

87.7 KB Created: 2021-04-09 23:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0d686d6700f192aabe18451ac53721dd SHA-1: 866ae08196e8a400878e2a3a16000dbcf84e203f SHA-256: b3ca791179ac464409bb19f28a67f3b360ecbb4ec3321d4228cdced18890d5bb
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 0.9994

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://baarspo.ru/strik?utm_term=what+is+ux+design+definition PDF link annotation
    • http://wiinorama.fun/juxisivovudizajvdtee.pdfIn PDF document text
    • https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/cdbb64b20.pdfIn PDF document text
    • http://optarfes.com/habit_reversal_training_online8ztsj.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/betixirufilu.pdfIn PDF document text
    • http://gunenekaroz.mypressonline.com/2565401299.pdfIn PDF document text
    • https://zerakilun.weebly.com/uploads/1/3/2/6/132695460/bebarigogowel.pdfIn PDF document text
    • https://tolawururajetam.weebly.com/uploads/1/3/4/8/134883146/batetukiniguzo.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/english_roots_prefixes_suffixes.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://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_ddcb9bc2f5bd404bbabcbdb7b31b9ce2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/94195720113.pdfIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_5b54a23d7c414588bf9da45adad55145.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1031b6f-4947-4010-afc6-41c3e1d5ceaa/batigud.pdfIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_7b32316ffdd04521b91fb37d3486af74.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_608a4f12a0e543df912696adb6f36046.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_fad22f5cdcac45d9a1a10b1c73c2b302.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48c2b400-d5eb-468e-939d-f4926ce26d13/war_of_the_worlds_2005_tripod_sound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b72dad7-cc8c-4536-99c3-601fd45a1987/how_to_replace_apc_smart_ups_1500_rack_mount_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/zexobinumawexexipak.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/how_to_make_holy_oil_from_the_bible.pdfIn PDF document text
    • http://vekemelegewimo.atwebpages.com/tetoxusogivumiwapa.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/76985564824.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/13406331849.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_off00010e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 5004 bytes
SHA-256: 1115a266e55f152830f19d7cc68de12cf79082938db9959cccdc14f2377308f4
font_01_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 10600 bytes
SHA-256: 0183d5920330ccd25f7b7af17475ba4aaf21d625f1706672a24c21f4e07a6da9
font_02_sfnt_off00014349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14349 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e