Malicious PDF — malware analysis report

Static analysis result for SHA-256 f750ba9c33ec09e4…

MALICIOUS

PDF

74.3 KB Created: 2021-02-19 22:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3419adc9c4a36ba6fecc306bb04a1521 SHA-1: 07897016d520ba7569e2803d0c21b466290b39bd SHA-256: f750ba9c33ec09e45930cfd279bb63113eeadcc4605c607714c333121f22d150
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware delivery attempt. The document body contains a lure text suggesting a confidentiality agreement, and numerous external links are embedded, many pointing to PDF files hosted on disposable or link-farm-like domains. The presence of external URI and link farm heuristics strongly suggests the document's purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=please+find+attached+the+confidentiality+agreement PDF link annotation
    • https://cdn.sqhk.co/pixafosabow/rggrfEW/tewagero.pdfIn PDF document text
    • http://study-english-05.site/pradhan_mantri_awas_yojana_application_form_in_kannada8vkvm.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/dgiIhgi/digestion_of_carbohydrates_proteins_and_fats.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/ogfibhf/4988461538.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/kjcMjiN/91754621893.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/AEV4jbt/art_therapy_definition_baat.pdfIn PDF document text
    • http://appless.space/flatland_edwin_abbott_freezfudn.pdfIn PDF document text
    • https://xikobidena.weebly.com/uploads/1/3/6/0/136097244/xoxejo-zokuwa-kuzavew.pdfIn PDF document text
    • https://dugeditukuvil.weebly.com/uploads/1/3/4/7/134723955/popogepanatuwi_fogitejulaf.pdfIn PDF document text
    • https://cdn.sqhk.co/zamodozitip/giTigpx/immortal_destiny_yugioh_amazon.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/selekivexur-dawugegok-punekapukij-tiselav.pdfIn PDF document text
    • http://kino-vezde.ru/suzuki_m109r_performance_partscfc4w.pdfIn PDF document text
    • https://cdn.sqhk.co/sewoliwadumi/piiaNhc/learn_spanish_vocabulary_with_pictures.pdfIn PDF document text
    • http://passive-income.ru/zombie_army_4_dead_war_pc_gameplayzd327.pdfIn PDF document text
    • https://mogopefisumiba.weebly.com/uploads/1/3/5/2/135295831/7a50b109b47.pdfIn PDF document text
    • http://fruittea.space/axa_framlington_monthly_income_fact_sheetblvgg.pdfIn PDF document text
    • https://wukarogokemek.weebly.com/uploads/1/3/0/7/130739107/tozovufuwim.pdfIn PDF document text
    • https://cdn.sqhk.co/konanetufuda/Trhidjj/horizon_hobby_rc_car_review.pdfIn PDF document text
    • http://idealsit.fun/55936317498y76dn.pdfIn PDF document text
    • https://vekatofe.weebly.com/uploads/1/3/0/7/130775682/1591292.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 5536 bytes
SHA-256: 9256a56974b4ad2175d3f3ab8a3758587144d13f49fe0fadcd84047df7f5512c
font_01_sfnt_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 2944 bytes
SHA-256: 03621652d10fb600abcbe8c31ed6680bc298fb16a6360f8de22481a905398700
font_02_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 10648 bytes
SHA-256: 2852eab5f565eb122328754fe2eee97e4fb13e8d2f56019b11919b89451487fb