Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bfe11de75781d8…

MALICIOUS

PDF

77.0 KB Created: 2021-04-26 18:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5b8f8a961d9f708d026cbe1a457fc6bb SHA-1: afc81109aaebcbff99f5f37bc59570de107e4b69 SHA-256: 20bfe11de75781d8698b884a417b74d8beb86d4923dfb8de07a38180e8f4c623
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-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://jacksth.ru/strik?utm_term=what+is+classed+as+a+leisure+activity PDF link annotation
    • https://butilitari.weebly.com/uploads/1/3/3/9/133997497/0c52d3659.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/penyebab_atonia_uteri.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/51536338739.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/26263165368.pdfIn PDF document text
    • https://javimitama.weebly.com/uploads/1/3/4/3/134349319/jimemeg_veroxara.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fd038c295909.pdfIn PDF document text
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/sifekufup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426682/normal_60047a915334b.pdfIn PDF document text
    • http://pozonewexoz.iblogger.org/how_to_unclog_my_dirt_devil_vacuum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_6048eec896122.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/nopoxajumavojesubij.pdfIn PDF document text
    • http://nipawifaxupus.mygamesonline.org/why_isnt_my_ryobi_pressure_washer_working.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/rasaxivumakidibaweke.pdfIn PDF document text
    • http://ferafukapawap.scienceontheweb.net/musofewugagosolu.pdfIn PDF document text
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/9808853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_60687edea6ba6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gizixaxeviduf.myartsonline.com/btec_applied_science_level_3_unit_1_revision.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_ae68336ff9d2400ab35713fafafae88b.pdf?index=trueIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_7ba40a34ec9d4cdc86216923dc4b24b2.pdf?index=trueIn PDF document text
    • http://voxavupe.epizy.com/46764028725.pdfIn PDF document text
    • https://96daf755-36ed-4ece-a185-bed8db3f70ea.filesusr.com/ugd/a95cda_fecd9b4808f042da92e6ad657c69c8ef.pdf?index=trueIn PDF document text
    • http://wotimadugol.epizy.com/escape_room_mystery_word_level_143_answer.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_a66b27b220c74e5a98f0e31d1c1e4cd3.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_9c04b0ec2bad4f83b5f58799d9d7ab2f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 5200 bytes
SHA-256: b094459174bac53371edda88d49bcbae251348406b9523800692412a771d4c2e
font_01_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 10880 bytes
SHA-256: fb34b45718d492af033139a07861eca14992b639e8c3cf6da79a9ed07cb043cf