Malicious PDF — malware analysis report

Static analysis result for SHA-256 d724884cf61266a5…

MALICIOUS

PDF

81.2 KB Created: 2021-04-05 19:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4753732a349a29364017b8466eee83e1 SHA-1: 566ac4d99d22c5d6cb4eccb0ac71e52d207bfad4 SHA-256: d724884cf61266a5fec03e40922113225b58b399031d03d93df948184d0278eb
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 0.9996

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://midufefew.ru/award?keyword=amyotrophic+lateral+sclerosis+pdf+2020 PDF link annotation
    • https://cdn.sqhk.co/fodexuxefeba/iCjcIoJ/where_to_buy_cross_stitch_fabric_in_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/cIajbob/pifodutazibifo.pdfIn PDF document text
    • http://x-bionic.shop/477138942752fr2v.pdfIn PDF document text
    • http://sodaapp.pro/jands_vista_2_software_updateir6qy.pdfIn PDF document text
    • http://naturwow.space/funozemofp29z.pdfIn PDF document text
    • http://icily.xyz/63487429362maliw.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/17091526409.pdfIn PDF document text
    • https://cdn.sqhk.co/seduregudire/ohajbgd/facebook_logo_2019_for_business_cards.pdfIn PDF document text
    • http://tegor.xyz/dont_shoot_the_dog_audiobook_downloadamu26.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/53571982006.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/Xig7iji/mcdonald_s_breakfast_menu_nutrition_facts.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/vuzusogewuzen.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/MjgGTk5/27174720440.pdfIn PDF document text
    • https://cdn.sqhk.co/vorowobenune/ciaujhI/dj_scratch_sound_effect_fl_studio.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopijaku/yhfU0jg/acapella_picplaypost_apk.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
    • https://uploads.strikinglycdn.com/files/5eeaa858-3755-412f-9987-ec8b7544b258/saunders_nursing_drug_handbook_2020_free_download.pdfIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_d841307fa1e448ffa299d34b7eb63ded.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_56c30eebed6647d4988dc1685d38de7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f54fee7-bb9b-4389-9856-bac179553fe2/jizivonurigakakogetofavob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af91be5-41ea-40e4-9b8d-ac467e13c3b1/wukogomitupogamen.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_off0000ee9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 5444 bytes
SHA-256: a329c090f1516eca3b286db235aadd1d2bcbff0ed041f2acbaacb9a9ce8b8efe
font_01_sfnt_off00010125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 11320 bytes
SHA-256: 3ee3601dc620d7f5ce1e5b6bb506fe7c23161eecffc2f94dbea2df273fecfce9
font_02_sfnt_off00012772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12772 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3