Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ca4a50fe58efce…

MALICIOUS

PDF

77.0 KB Created: 2021-05-09 01:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d2be3332fe81c5251aa74025e7f54803 SHA-1: 41260d321cde150c90e537a0a013d8bd39d61ac7 SHA-256: a0ca4a50fe58efce0cc410cc127a8cc661b8d235a1e1003855963514f1bd3e6b
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://pelibifir.ru/strik?utm_term=formula+para+sacar+el+volumen+de+prisma+triangular PDF link annotation
    • https://cdn.sqhk.co/falugojafat/cfMSNjj/ten_pin_bowling_rules_and_scoring.pdfIn PDF document text
    • https://cdn.sqhk.co/jixavome/sjfPjbX/81369596597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476445/normal_5febef7787560.pdfIn PDF document text
    • http://aycotoro6.xyz/nespresso_aeroccino_4_not_frothingnsdqx.pdfIn PDF document text
    • http://ejqy.com/sys_platform_is_not_definedijrpn.pdfIn PDF document text
    • http://zathkatow.xyz/wibaxonumizozifusitalcc8ft.pdfIn PDF document text
    • https://cdn.sqhk.co/jogowijalaro/k3hayn3/bixapef.pdfIn PDF document text
    • http://cmb-accueil.com/gisifaturex4vjrc.pdfIn PDF document text
    • http://smartroom.pro/homelite_pressure_washer_2700_psi_partsqmcli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415322/normal_5fe208e9dbe88.pdfIn PDF document text
    • https://cdn.sqhk.co/vavegewumur/qL3iiBo/korogiteba.pdfIn PDF document text
    • http://hurleyshamburgers.com/deep_nutrition_why_your_genes_need_traditional_food_free_download05b99.pdfIn PDF document text
    • http://sodalabs.club/moto_g6_play_cover_amazonz841r.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/hgLiagc/zuma_deluxe_apk_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/ifhhij6/96065427116.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/eb8j767/35846140439.pdfIn PDF document text
    • http://aycotoro7.xyz/what_is_strategic_human_resource_management_definitionaifqr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_de0960240dc04cb4a5815e41a89cd95d.pdf?index=trueIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_9beda3c2cd9e4b0c8cd6f73b9e6bacef.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_72cd3677be924bcfa5830156ab9dcc13.pdf?index=trueIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_3508195d52954cc5b66ae15dff9f8f1a.pdf?index=trueIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_caed0ea6be944a83b4c10bbff652f1f7.pdf?index=trueIn 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_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 5408 bytes
SHA-256: 780dbe6e8269495849da51840bf929786d09e02c8821959c76283c4898fa97ec
font_01_sfnt_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 12056 bytes
SHA-256: 3ed41bcbc18e4879431ed924a5e97af2b40c0a004ef7e699ac0bfcc332a76adc