Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7443b9dd860c69…

MALICIOUS

PDF

75.7 KB Created: 2021-03-19 13:36:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e93b7ceb85c44752f4de00a9ec94a462 SHA-1: 2267fe25e55133c0aad89d3d48f912852a06e702 SHA-256: 8f7443b9dd860c694b54001dbcf0644194cf0eb48dcf192e2d69e9771d0f773d
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely distributed as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=husqvarna+jade+sewing+machine+reviews PDF link annotation
    • https://cdn.sqhk.co/muzipajat/EgiaAie/watasigew.pdfIn PDF document text
    • https://cdn.sqhk.co/duzupafuj/fjgiaDN/jevurizuki.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/ohdJbic/dajamewaxebatofel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_37cfeb007ff847f3883ad4a308975ce6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/better_half_full_hd_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56155b3e-0d7e-41f7-93f4-6d0ae7c22204/what_is_the_meaning_of_the_name_tanya_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72d76b8-cc08-4d23-82c4-d83367cc6d00/estructura_de_un_texto_expositivo_para_nios_de_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72fca0cc-ddaf-4eec-9316-2c9149e77598/breville_l.p._bje430sil_the_juice_fountain_cold-juicer_silver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0daddc-cb49-4e57-8995-e70f68ad7b3e/9901069210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b473a213-5107-4a6f-aee3-13c07cebafc7/15518082504.pdfIn PDF document text
    • http://kotowadanoli.epizy.com/21126702133.pdfIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_a998c711cf2c46609c357c7cea421cac.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_16bfc24cbb7b4befb9b48d27b6d21cbf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a52d54-bf44-4a18-80e5-4a11863b1cdc/advanced_dd_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b80ea6-018a-4552-b974-467a11ed3611/ejemplos_de_estudios_de_casos_escolares.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/manual_da_geladeira_brastemp_clean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3dbff39-6971-49bd-be8e-b1e72b781df8/54026972045.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/baleno_car_photos.pdfIn PDF document text
    • http://pitikepaz.epizy.com/61605750540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/572b81cf-b62e-4eaf-b753-642495d8c19e/daisy_miller_a_study_in_two_parts_by_henry_james.pdfIn PDF document text
    • http://fowagimumaviguf.rf.gd/17675503688.pdfIn PDF document text
    • http://doxinaxa.epizy.com/asc_740_guide_kpmg.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_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 5636 bytes
SHA-256: 016b4f8b43cc7ad45fd2e39808fdd442def9b01e793e3bffb559fad2bb4928aa
font_01_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 10484 bytes
SHA-256: a410819de9927038d45ef823e726b79208c528a6ab43f2426b18b3c98fd9e062