Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1b15d3288fddcf…

MALICIOUS

PDF

76.7 KB Created: 2021-05-12 11:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e5f3f0a9717b29df36a0907b5e5ffd0e SHA-1: 289d834c3fbba04e2ac3009cefad360841c7f4a1 SHA-256: ac1b15d3288fddcf3c934d10b70d2506c3eb1cd1fd2a3ef51ab8b2b2edd22959
156 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 0.9997

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=panasonic+kx-t7633+voicemail+setup PDF link annotation
    • http://svoylend.xyz/cognitive_psychology_applying_the_science_of_the_mind_4th_editionarvp7.pdfIn PDF document text
    • https://gilukuxuzi.weebly.com/uploads/1/3/4/4/134494221/bamugaminiwire.pdfIn PDF document text
    • https://fanonobumoxevo.weebly.com/uploads/1/3/1/3/131384335/96f14b.pdfIn PDF document text
    • http://maska-respirator.com/moxovubamekuxupekudomawuv4x2lr.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/zafelon.pdfIn PDF document text
    • http://rodsfish.club/2361533988b1ym5.pdfIn PDF document text
    • https://suwisabinupa.weebly.com/uploads/1/3/5/3/135351097/lojaxamefuki.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/dgegj7s/natudetizidelixefe.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/ibRHjiL/dilujogetilazawenojum.pdfIn PDF document text
    • http://fineagencyy.com/what_to_write_a_narrative_essay_topicskzp8e.pdfIn PDF document text
    • http://vir-tus.com/tulozimimuxinalimodiboj44caf.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/UFgnOch/download_moy_5_virtual_pet_game_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/88261949147.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/jutujipixoduj.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/riguwaselapixajiriw.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/anrufe_blocken_android.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/dijava.pdfIn PDF document text
    • https://ac6a5e95-3fab-4d4b-a7e7-0ef4c71e5929.filesusr.com/ugd/32c278_f139cb7ede27488bb25de0d9e16526a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/tutorial_onenote_for_mac.pdfIn PDF document text
    • https://6dca1d0c-b102-4aa4-a312-d013f97c39dd.filesusr.com/ugd/fb87fb_221267f14c6944a89b565b696a61c88f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/pupemenunikid.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_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 5604 bytes
SHA-256: dc5c90d9eb47208aa8b6687edeb53ad9807051d4b1ac6e48aa7ea52fc3af33c7
font_01_sfnt_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 11172 bytes
SHA-256: 0dfaf5ba8654446697b10039bea6ecf6c3206da350b6913ba2169f2c8863d6a7

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