Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbabcdfd148554b…

MALICIOUS

PDF

79.6 KB Created: 2021-04-29 01:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8f00884e1416823d2d21d1fa1d698ba3 SHA-1: 726be59095d8be8fa6a85cb9e5ec325048fe34f6 SHA-256: 7bbabcdfd148554bef845fc375850382707941bb285bc23fdfc188366e5701d3
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://dafemum.ru/strik?utm_term=what+is+the+generic+outer+electron+configuration+for+alkali+metals PDF link annotation
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/dbd39cd5.pdfIn PDF document text
    • http://gosunenibunale.getenjoyment.net/mini_international_neuropsychiatric_interview_franais.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/how_to_setup_denon_zone_2.pdfIn PDF document text
    • https://zewalomoweso.weebly.com/uploads/1/3/4/5/134588134/zedariwix_madegadarim_fumimuwezoza_xogewuk.pdfIn PDF document text
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/kosigakevojajo.pdfIn PDF document text
    • http://valuburikodajad.medianewsonline.com/gegapexanofe.pdfIn PDF document text
    • https://zulijijala.weebly.com/uploads/1/3/0/7/130740393/1823607.pdfIn PDF document text
    • https://tariwina.weebly.com/uploads/1/3/0/7/130739483/34113f0.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/warosi.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/22041764974.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
    • http://domebiwek.myartsonline.com/banting_diet_meal_plan.pdfIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_3b1444bcd4ba40e198d60d32780f9a32.pdf?index=trueIn PDF document text
    • http://gazunobopa.epizy.com/44077473174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf34b878-1c9d-41e1-9894-0af70f5c844d/heart_of_darkness_quotes.pdfIn PDF document text
    • http://selominur.epizy.com/what_is_insufficient_material_in_chess.pdfIn PDF document text
    • http://giworutiw.myartsonline.com/nusano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e48009-5ade-463b-bf32-115df633c1b7/81796283307.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_16a4e85706ef44f4acc37db3a9406548.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/978b9391-083c-4690-b2c7-c32edab5f5d0/canon_canonet_ql17_giii_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80916bf1-23f1-49a1-a6e5-194c96d10ed3/how_do_i_know_if_my_battery_tender_is_working.pdfIn PDF document text
    • http://bifelizebov.rf.gd/wikebixawufudop.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_bd373756ea4e4126ba1590c3fc98e38e.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_0be09c71a2c64104b337992c5026842f.pdf?index=trueIn PDF document text
    • http://puxakuxuvon.epizy.com/dvt_management_guidelines.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_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 5252 bytes
SHA-256: b5cefad17682e5d018d47eb2a7a18ba7ff0bee6b80e5f0625879ef0b06297f4d
font_01_sfnt_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 11060 bytes
SHA-256: 51585d146fc1e73ef1a4bd4bbbc1158eb8a9fd380591d0612515e55829149fb8
font_02_sfnt_off0001221e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e