Malicious PDF — malware analysis report

Static analysis result for SHA-256 28650519520957c7…

MALICIOUS

PDF

77.3 KB Created: 2021-03-07 03:36:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 758239ba64152fcfa5bfbd054a3b9d5d SHA-1: 28562851b04c08b02b82342c145fb1624127364c SHA-256: 28650519520957c73833758bc2574783e7fd53c5d7fe07b72e38cd3320f41460
344 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is a PDF that contains numerous embedded links, many of which point to disposable hosting or redirectors. One critical heuristic indicates a brand-impersonation credential phishing lure for Microsoft, using a link to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily corrupted, contains text related to 'hotmail.com sign in', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xibuderopugef.weebly.com/uploads/1/3/4/0/134042602/vetubafixo-kajoso.pdf.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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/wix?keyword=www.hotmail.com+sign+in+my+account In PDF document text
    • https://cdn.sqhk.co/vavewiren/hKtDSrd/fizumixutupomaf.pdfIn PDF document text
    • http://shishkin-seed.xyz/lapuwuwy29xk.pdfIn PDF document text
    • http://vvinorama.website/wiwetezuwugya359.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/hcKginP/drive_in_movie_near_me_nj.pdfIn PDF document text
    • https://xibuderopugef.weebly.com/uploads/1/3/4/0/134042602/vetubafixo-kajoso.pdfIn PDF document text
    • https://setitafonoje.weebly.com/uploads/1/3/1/8/131856277/d79b7a96b3.pdfIn PDF document text
    • https://cdn.sqhk.co/rojotuwo/8TU0ijD/telangana_gattu_meeda_chandamama_naa_songs.pdfIn PDF document text
    • http://vorecan.space/fatugupewizoxubopjibex.pdfIn PDF document text
    • http://zoompol.xyz/scom_installation_guidesqxt0.pdfIn PDF document text
    • https://sulasaboxa.weebly.com/uploads/1/3/4/7/134767053/2a71866868c.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/00LdUOz/legends_of_heropolis_mod_apk_2._1._4.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/92eDxgj/8_ball_pool_online_hack_tool.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/e5671dfc-8a53-4154-a458-f4b205aec3bb/white_fang_2018_imdb.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/goed_informeren_synoniem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/182659a2-9f77-4787-ad3b-5afada4cc193/fewujoluresukixokipin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91d5ec5-92af-408f-b57e-aff324cd4cf2/how_to_replace_heating_element_in_water_heater_electric.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/spider_man_comics_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/el_arte_de_la_seduccin_pelcula_completa.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/58575939608.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/34772079488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f76b047-acd6-4ecb-9a21-5c23b5c40d44/bissell_readyclean_powerbrush_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687005e4-980b-4556-aa52-a9d978a4c29d/how_to_print_without_replacing_color_ink_epson.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 5356 bytes
SHA-256: ad837e2839bdbd3147cf4e630ef61c1ebeeec5d858e575d82a85c2df69b23638
font_01_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 10276 bytes
SHA-256: 94f6bde035b0b3a38bb8650d789ff2e2cc76d1918cf44304fa8753e53dffeeac