Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a3c3244dfecbe8…

MALICIOUS

PDF

76.3 KB Created: 2021-03-19 18:32:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 74a31b1899624a31fa7e678343af5908 SHA-1: 4422d7b8341dc56a81a1a37a35084d7cf4ed429f SHA-256: 66a3c3244dfecbe876fbdb7a07014ee7d36e984aa9bac5c6c752090ee3c444b4
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the presence of numerous links suggests an attempt to direct users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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 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/strik?utm_term=lenovo+thinkpad+t430s+recovery In PDF document text
    • http://zdsshop.top/celestial_pact_warlock_5e5ag9l.pdfIn PDF document text
    • http://chelamela.org/wezosubp8bhl.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/how_much_do_entry_level_information_technology_jobs_pay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374022/normal_5fed67a013a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_6049c96a7f6d0.pdfIn PDF document text
    • http://kisiguvawatabom.22web.org/lumumogafigafararedori.pdfIn PDF document text
    • http://tehnikator.ru/61574702004mtueb.pdfIn PDF document text
    • https://xudekumuf.weebly.com/uploads/1/3/2/6/132681038/surumivolizaf_dedodoni_vipibetino.pdfIn PDF document text
    • http://parralax.net/california_state_jobs_administrative_assistantyzp99.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/tebesutem.pdfIn PDF document text
    • http://afracheat1.xyz/platform_shoes_nz_cheapnh9jk.pdfIn PDF document text
    • http://nulivanofika.mygamesonline.org/gcra_bursary_application_form_2020.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/4990229.pdfIn PDF document text
    • http://xubajur.mygamesonline.org/wevevafunidazutipifo.pdfIn PDF document text
    • https://pogedufofow.weebly.com/uploads/1/3/4/5/134512351/tapaxu-geladijamiro.pdfIn PDF document text
    • https://buzegiregusa.weebly.com/uploads/1/3/6/0/136082094/509931cbc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_602fc9582eed9.pdfIn PDF document text
    • http://jozoxumugeg.iblogger.org/the_ruins_of_gorlan_audiobook_free.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/nadimininem.pdfIn PDF document text
    • https://begagezegitajaj.weebly.com/uploads/1/3/1/3/131398046/8847209.pdfIn PDF document text
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/gewilusuki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kobatalizaz.epizy.com/razor_e200_battery_replacement_instructions.pdfIn PDF document text
    • http://jugututinotu.rf.gd/61866562949.pdfIn PDF document text
    • http://kubumoran.rf.gd/flipshope_flash_sale_chrome_extension_download.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_off0000e919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 5688 bytes
SHA-256: 9f1f88dce294a76894b50419a6c0080a5756056151c0487a468540e12fddefbe
font_01_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 11648 bytes
SHA-256: aafa563ea3d5454188f42c4f5b7da467a531acd721e26d1dc6226ccfc8da58fa