Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d791715e562625…

MALICIOUS

PDF

88.9 KB Created: 2021-04-19 01:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 14377b2a411c0a9f2ab9d97aeee54014 SHA-1: 3282815773edf3fbab173320711bf7dce3d67c0e SHA-256: e2d791715e562625356d94a9c29451840893bc2b3ae5312fff16796ea159ba8b
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt disguised as a job description. The ML classifier strongly indicated maliciousness, and the structure points towards a T1566.001 (Spearphishing Attachment) attack pattern. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://pelibifir.ru/strik?utm_term=risk+assessment+coordinator+job+description PDF link annotation
    • https://posukezeke.weebly.com/uploads/1/3/4/7/134746748/dolipazuvukuraguko.pdfIn PDF document text
    • https://koberowebajufom.weebly.com/uploads/1/3/4/0/134096943/lurigelow-zotewuzigosig.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/4464970.pdfIn PDF document text
    • https://pogipusuzifu.weebly.com/uploads/1/3/4/8/134869227/zizami-suzidife-zafit.pdfIn PDF document text
    • https://wagemerefav.weebly.com/uploads/1/3/2/7/132712282/bumogunikamopiwezeba.pdfIn PDF document text
    • http://lixamewura.iblogger.org/41177783259.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/74813811-dab6-4e3d-8db3-24c82ef05c9e/chess_game_learning_app.pdfIn PDF document text
    • http://jaledab.epizy.com/85756836583.pdfIn PDF document text
    • https://8a05da06-75fd-4b4b-8779-f7668a2fa4a0.filesusr.com/ugd/da32d9_a7624ae2459d45edb41abb39654e284f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4263171-a6e7-4b50-befe-8787cb729b81/sabazupavanugovediz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/093e8177-a631-4698-9034-7ea46e873f14/6908550258.pdfIn PDF document text
    • http://wejisisinutuvir.epizy.com/all_fruits_and_vegetables_names_with_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd5c726-9c99-4420-a116-86a7b61e2b92/75054490677.pdfIn PDF document text
    • http://pasazaxara.rf.gd/tuzudozesetozufigujur.pdfIn PDF document text
    • http://xonozuwalod.rf.gd/zujakafodiwesesoreni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99915930-f7d3-4b20-886b-f00dea252398/yard_machine_edger_3.5_hp_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f266f2ac-2137-4cc0-bf4f-2722c0148eb4/important_quotes_from_a_river_runs_through_it.pdfIn PDF document text
    • http://lekipuvuji.epizy.com/democrat_and_chronicle_bills_report_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd44308-b8f9-4059-a4b7-dbf23c862b31/dewalt_3000_psi_pressure_washer_pump_replacement.pdfIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_a2d2fb51163d48ad9ce5484a240e2b29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3518909f-b989-4db1-aee2-7c4a08a99cf9/hampton_bay_fan_remote_control_battery.pdfIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_eb1c61ae6e8340cf80453e644fcb4b50.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_68f5ecfc577442e0b542f18c5f653a21.pdf?index=trueIn PDF document text
    • http://jitemawuvefogox.epizy.com/borevulobaj.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_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 5476 bytes
SHA-256: 98046125ee4547b0518c182ccce7b90cb60d544a0932dd03585a8e5a97bbcef8
font_01_sfnt_off00012f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F23 11408 bytes
SHA-256: d421819bae20d46b6c911751720e0ec34c010826e734ae2dc5b641ed83ab7c7b