Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcaf37d5c9d95d91…

MALICIOUS

PDF

82.8 KB Created: 2021-03-25 06:17:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 37e5cd28bf2993615334bbc3ce8c4750 SHA-1: d03b8618c2161f543a55242ff7d249636d43a4de SHA-256: bcaf37d5c9d95d914189a4ce7e6a6998b0a34388c6b165eb2f7721a588c0ec58
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://botokaw.ru/wix?keyword=triangle+proportionality+theorem+practice+worksheet PDF link annotation
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/zutokagitugiki.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/kirufefuzudowu-guremikumem.pdfIn PDF document text
    • https://bukalejobiwasek.weebly.com/uploads/1/3/1/4/131409200/b4703f24e2a.pdfIn PDF document text
    • https://kukiramofup.weebly.com/uploads/1/3/1/4/131413837/majowudigivaniki.pdfIn PDF document text
    • https://rimedugomo.weebly.com/uploads/1/3/0/7/130740195/279399.pdfIn PDF document text
    • https://vatifogogunubit.weebly.com/uploads/1/3/4/7/134725392/1347268.pdfIn PDF document text
    • https://lewezuwarekizes.weebly.com/uploads/1/3/4/0/134040914/dfb25eda777d.pdfIn PDF document text
    • https://zamovolipizutuj.weebly.com/uploads/1/3/1/0/131070940/2b5e4dd1153971.pdfIn PDF document text
    • https://kixasakuzejud.weebly.com/uploads/1/3/5/3/135347884/1921881.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/69593d73-c17d-4d0a-bae4-36e3ca4bbea7/john_deere_lawn_tractor_parts_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05799d56-b35a-41f2-a764-8222410486f0/3134585617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d78d9009-afca-47db-9207-5b6dbc0de8cf/zifebasoxufajasowulove.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/empower_c1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65cb669e-f95b-4003-9756-7312ec7402bf/how_much_does_chipped_tooth_repair_cost_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53684a2-d00c-4826-8929-72e26e68c7c7/does_my_book_have_an_ar_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a09522a-d10d-4171-b15a-537651c2acc0/coleman_lay_z_spa_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf94da3a-2a69-4ad3-8b34-2a40e2e96c45/tosamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b51164-8456-489e-8b5f-40fc1b2ecbbd/materials_science_and_engineering_9th_edition_solutions_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/celine_dion_songs_1990s.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/kasoginib.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/11074353426.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/thule_apex_swing_4_bike_hitch_rack_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/bazusugiboza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8447c140-72a7-4fae-a045-fd7ca4692924/mechanical_project_engineer_jobs_in_australia.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 6832 bytes
SHA-256: 8ffa0a7012bdbc979f05a63d7f75e73875829669dce55cdcbc4c4d8d4cc6eb8f
font_01_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 5556 bytes
SHA-256: 6386ec8602178b317008da14940a18da4a67f4c9c4b1f6fee380db43a8cb8393
font_02_sfnt_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 11604 bytes
SHA-256: 35f44f7bd2e1b175987dcba3754156e410054f477f110259c891275b151133b0