Malicious PDF — malware analysis report

Static analysis result for SHA-256 761ec963e92f4069…

MALICIOUS

PDF

77.7 KB Created: 2021-03-01 02:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 35d22a16febf7b2d827075c3a9af6d90 SHA-1: 2a34dc340741f573f95d866b43fcbf567cb05692 SHA-256: 761ec963e92f406932f25573e146d9860f5c5c4e618cc36d5700d51283291c81
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing and scam operations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains a search query that could be used to trick users into believing the document is legitimate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=how+do+i+contact+better+business+bureau PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388422/normal_5fe2962e00361.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/modelo_carta_comunicacion_interna_empresa.pdfIn PDF document text
    • https://fapezadedafax.weebly.com/uploads/1/3/4/6/134609176/samubuve_nugosipidi.pdfIn PDF document text
    • http://towudarefu.22web.org/16609531096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_60158a0be5dfb.pdfIn PDF document text
    • https://sanexopapodepal.weebly.com/uploads/1/3/0/7/130739353/kenapisajena_kituxude.pdfIn PDF document text
    • https://lomofatawepap.weebly.com/uploads/1/3/4/5/134599642/fe7198a1dc99a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486042/normal_5ff1fddb6a9f0.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/99390327943.pdfIn PDF document text
    • http://mamivadusijuf.iblogger.org/couple_dance_form_name.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/xorosegajemo-zugokimogirike.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/how_to_count_digits_in_excel_cell.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://livirava.atwebpages.com/12076197238.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/classification_of_antibiotics_and_their_mode_of_action.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/87108231624.pdfIn PDF document text
    • http://dixadenidufudu.epizy.com/25891186111.pdfIn PDF document text
    • http://fiwipofel.epizy.com/petel.pdfIn PDF document text
    • http://rabewifawilowe.epizy.com/sheetrock_gypsum_lay_in_panels.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/public_accounting_report_school_rankings.pdfIn PDF document text
    • http://marivugedada.epizy.com/ecology_and_society.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_off0000e5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 4976 bytes
SHA-256: ae72cc71542f63fb0d88b76895dfcb409e583e3f1b25e6e654622a6daff445b0
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 10756 bytes
SHA-256: fd88d2deb302dddae01cb49ea6b325b3c2cb9f2042ab02287125709a6bb912d7
font_02_sfnt_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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