Malicious PDF — malware analysis report

Static analysis result for SHA-256 791417ad0534bbe7…

MALICIOUS

PDF

77.1 KB Created: 2021-03-18 19:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 681e5fdc8600c190881494c02ddb8268 SHA-1: 7629935ab2fd8cb4369c1d80e929ab8f1e785fe0 SHA-256: 791417ad0534bbe74e1bf2cc6a942a522fbd163262cdc2866b1d282d6f54c784
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards the document being used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://ponafet.ru/award?keyword=easy+flat+belly+diet+plan+pdf PDF link annotation
    • http://gililofus.medianewsonline.com/my_first_bilingual_picture_dictionary.pdfIn PDF document text
    • https://felelitujafi.weebly.com/uploads/1/3/5/3/135392562/depari_reguxatekima.pdfIn PDF document text
    • http://netewe9.xyz/336644959672b1z2.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/hsgdSib/31221230021.pdfIn PDF document text
    • https://wijinopupog.weebly.com/uploads/1/3/5/3/135323990/likirolerawadugefol.pdfIn PDF document text
    • http://sq11mini.com/2271964472ktoql.pdfIn PDF document text
    • http://govnosiakxws.online/lusidijewujiatxt4.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/jchcwCR/vegan_cotton_candy_ice_cream_recipe.pdfIn PDF document text
    • http://nosixavol.sportsontheweb.net/acca_f2_revision_kit_2020.pdfIn PDF document text
    • http://lordtrans.ru/stihl_bg55_blower_priceqefyq.pdfIn PDF document text
    • https://menuwenuxunok.weebly.com/uploads/1/3/4/6/134682317/5716133.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/sekaxipokonadorenu.pdfIn PDF document text
    • http://zugobopepoj.sportsontheweb.net/imperatives_exercises_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sizemogigu.myartsonline.com/how_much_is_an_inspection_at_delta_sonic.pdfIn PDF document text
    • http://famekuputoda.myartsonline.com/13748808482.pdfIn PDF document text
    • http://faxanudof.epizy.com/votuwemife.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/vapan.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/the_republic_plato_free_download.pdfIn PDF document text
    • http://resaruxowepu.epizy.com/ballistic_pendulum_physics_lab_report.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_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 5140 bytes
SHA-256: f4aa3782f743dfd57ad54140c52dccfcbe607bf6a665c7465ad5607f92756922
font_01_sfnt_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 10576 bytes
SHA-256: 8c9db857f90bc4d961f8b62d11be533d28e6778cc0b5cd33c5ee77b06733ce91

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