Malicious PDF — malware analysis report

Static analysis result for SHA-256 64be225748b0dfe3…

MALICIOUS

PDF

81.7 KB Created: 2021-03-07 21:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3cff5a6d5e87f588e5b2bd06ee13c160 SHA-1: 5c770efd36c1e909ecf01c9fb28500c562ef6b05 SHA-256: 64be225748b0dfe38b77731d213ebaa06a4de3d83247f43d4d4d218f82e1c33d
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://xezojetit.ru/strik?utm_term=asus+eeebook+x205ta+install+linux+mint PDF link annotation
    • http://dofegogojewipo.iblogger.org/53175343716.pdfIn PDF document text
    • http://dokojusekorukuf.iblogger.org/graphing_points_activity_worksheet.pdfIn PDF document text
    • http://voseboler.iblogger.org/duels_android_game_guide.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/53dd47dd-272f-4e91-9d6a-0ee50fbb245a/sunedawetejexopib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff0dd0a-8c03-4070-a4cc-7cbd581ef7d2/60419121020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc115a32-88b8-4604-bb46-2d06922ed4b9/10217299492.pdfIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_348a0975dc504a9eb288313703b644df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da21e023-56c2-4185-bbe3-bd242528d638/dunkin_donuts_matcha_green_tea_latte_with_almond_milk_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ec6041-60d4-4c0e-b900-8f06504ab81f/76786520146.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/enthalpy_of_fusion_for_ice_lab_answers.pdfIn PDF document text
    • http://wiwawilif.epizy.com/lewadosazoma.pdfIn PDF document text
    • http://sedilar.rf.gd/washington_gas_bill_pay.pdfIn PDF document text
    • http://miwusox.rf.gd/sololearn_pro_apk.pdfIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_620f0f708b3743da811fcd548321e6ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2001b204-c9dc-4080-aac0-3e64cedd527a/single_member_llc_operating_agreement_pa.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/how_to_use_k-cup_universal_reusable_coffee_filter.pdfIn PDF document text
    • http://jofarasaxorepow.rf.gd/simelebofatalikonifozis.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/gasteracantha_cancriformis_es_venenosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96ee57c1-578d-45dd-acb1-4b4dfefa5570/43068329853.pdfIn PDF document text
    • http://pulizot.rf.gd/mujikug.pdfIn PDF document text
    • http://likifodafiduno.epizy.com/12920480851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdc33f1-feca-45ea-95e1-8e7b6d65b583/what_is_the_prayer_for_the_dead_in_islam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7b5c97-e44c-4cce-a738-431eb4877ff3/skil_20v_cordless_circular_saw.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_3798c9b4e3bd45a088d437fac8b1c6db.pdf?index=trueIn 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_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 5276 bytes
SHA-256: 461bbbd9fd960d7d1a0cf9ec61653864c36b0c4cef0569896dea8f3e6e2237cf
font_01_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 11084 bytes
SHA-256: 9c47cd4198c89abcced2e01895ce4bd693df3f580a3341c51a0b502bddeead97
font_02_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3