Malicious PDF — malware analysis report

Static analysis result for SHA-256 4caa0dafb889a1d0…

MALICIOUS

PDF

79.6 KB Created: 2021-02-25 07:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 38f6bd6a25b8034db38917b85a56ce3e SHA-1: 0fc2cb9106e88e488f882c946be3fda5ca5e292f SHA-256: 4caa0dafb889a1d023ec0a0b614725baba0712fd1ac9bfd924c58d1b0d517660
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 0.9995

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://crophysi.ru/strik?utm_term=job+interview+questions+and+answers+sample+pdf+in+hindi PDF link annotation
    • https://vebavorosufate.weebly.com/uploads/1/3/4/7/134742301/4cc38ca5e455.pdfIn PDF document text
    • https://cdn.sqhk.co/gasariba/ajifDa3/gavan.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/how_to_drain_swamp_cooler_for_winter.pdfIn PDF document text
    • https://xamikike.weebly.com/uploads/1/3/1/4/131406211/4188d.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/nifTXii/mcmansion_tents_los_angeles.pdfIn PDF document text
    • https://relitemora.weebly.com/uploads/1/3/4/3/134352419/6557245.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/jgdheUo/date_the_girl_3d_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/E9uiKhj/62165604242.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/dFSieji/top_goal_scorer_english_premier_league_2020.pdfIn PDF document text
    • https://xidokuwu.weebly.com/uploads/1/3/1/4/131453793/3300196.pdfIn PDF document text
    • https://cdn.sqhk.co/febenanedibu/g4GgdgI/21475572329.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/eVgeiaf/red_blue_red_free.pdfIn PDF document text
    • https://gamitodotabezoj.weebly.com/uploads/1/3/1/4/131453651/tefozisug.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/lalanogojaxavabizegutep.pdfIn PDF document text
    • https://cdn.sqhk.co/forokuxodel/jg4hchf/download_rc_helicopter_ar_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/cmihrji/christmas_bingo_games.pdfIn PDF document text
    • https://fovibera.weebly.com/uploads/1/3/5/3/135324383/savitu.pdfIn PDF document text
    • https://cdn.sqhk.co/lunexubafexo/Xcnhagf/52739488646.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/haJnco8/lizutaxitoruven.pdfIn PDF document text
    • https://cdn.sqhk.co/fagijopi/dHqEcsb/the_crossing_2004_full_movie_free_download.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://zitasixan.atwebpages.com/what_is_the_cost_of_starbucks_coffee_in_india.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/takodutezafokolamaj.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_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 5572 bytes
SHA-256: 1d9d76b03e3208f35f5ea2ad823dc20c973d7d9e9b3a84db1e802c05e50c18b6
font_01_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 9928 bytes
SHA-256: 7e7a673758d04d36f1fbd98e928224fe3da541c8ae8cfd19df99dbd7d26c9e6c
font_02_sfnt_off0001227b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f