Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cfba5a6acaee78…

MALICIOUS

PDF

82.2 KB Created: 2021-03-18 18:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c76e233a4c4873dba814c11e781c8026 SHA-1: fbd026867cecddb727b77c2897e1980938a39055 SHA-256: a0cfba5a6acaee78efc9917cdb0c82be3dce37f7508c9d3eb827a1c1445c5e24
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a tactic of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=how+do+i+reset+an+airport+express+base+station PDF link annotation
    • http://sk-anker.ru/aircraft_technician_salary_ukc5to4.pdfIn PDF document text
    • https://cdn.sqhk.co/wofutajo/gdVhhIW/dasom.pdfIn PDF document text
    • https://cdn.sqhk.co/funixatugesi/jcjgXjf/ritrovare_foto_eliminate_android.pdfIn PDF document text
    • http://afterdealer.pro/244754544038wpi7.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/Dyhjchw/find_the_hidden_objects_printable.pdfIn PDF document text
    • http://rivalo130.com/concepto_de_artes_visuales_forma3hcep.pdfIn PDF document text
    • https://cdn.sqhk.co/rowunozimop/Ugfibic/youtube_history_channel_american_civil_war.pdfIn PDF document text
    • http://jofipifemu.medianewsonline.com/business_english_writing_advanced_masterclass.pdfIn PDF document text
    • https://vexigijetizi.weebly.com/uploads/1/3/4/7/134771524/5492388.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/how_to_fix_dish_hopper_remote.pdfIn PDF document text
    • https://kagojidumone.weebly.com/uploads/1/3/2/7/132740327/4a496fdc595.pdfIn PDF document text
    • https://cdn.sqhk.co/baxewoxevum/ejeicji/social_media_app_apk.pdfIn PDF document text
    • http://naturaleone.space/defender_24_hour_segment_timer_manualpjyto.pdfIn PDF document text
    • http://small-italy.space/mirifudimowurame08e.pdfIn PDF document text
    • http://citrus-fruit.space/birakapipikojelelha51.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/75217c18-49b3-42ff-a79a-ce459dbbe866/que_es_titulo_ejecutivo_arba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af593d19-1033-4d17-a01e-377f45cb1697/the_yearling_1994_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aebdee44-28a2-4014-9d22-62d2cc38bbdf/what_age_group_is_wicked_appropriate_for.pdfIn PDF document text
    • http://suwuriru.onlinewebshop.net/womens_roadmaster_bike_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15df9f0-d255-4e48-bbd0-88da76a2a590/40281365328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b6fcb2-269f-4a23-97ba-829877005533/thomas_troward_francais.pdfIn PDF document text
    • http://dogiwexor.myartsonline.com/geography_landforms_worksheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 5184 bytes
SHA-256: 89a2055d5f452c24683f34edf312d544e95096e9ce417c1989930baa7b908a76
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 10340 bytes
SHA-256: 26a06472edf6360de5bad768099f96664655f0cae066f7b8f456d08e1ff7f90e
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 16388 bytes
SHA-256: 792d94d721ed0b6f37dc0a2c63227a1e02ba985f3311c734d905b891e1ee35e8