Malicious PDF — malware analysis report

Static analysis result for SHA-256 89db0503383d9410…

MALICIOUS

PDF

76.6 KB Created: 2021-03-17 14:27:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 96b0124ab839a99717215f7e57b27d0c SHA-1: eb88005f04ac23d68d7ecbba0745f22e06d700af SHA-256: 89db0503383d9410adfb94bd6dd00b9915158b14edb9ab0142e5b180bd9920bc
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://yafferge.ru/strik?utm_term=how+do+i+say+daughter+in+law+in+spanish In PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/d79a354fcb8.pdfIn PDF document text
    • http://baby-slings.ru/dazadepokevisadubrr02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_60118ef969a02.pdfIn PDF document text
    • http://goodnatural.space/movies_counter_free_bollywoodiw00l.pdfIn PDF document text
    • http://knitfqph.site/pokemon_dark_rising_walkthrough_guidezozqz.pdfIn PDF document text
    • https://gedofulijul.weebly.com/uploads/1/3/0/7/130775434/28afaf.pdfIn PDF document text
    • http://lianhua.life/61571035406149eg.pdfIn PDF document text
    • https://jojapewabivato.weebly.com/uploads/1/3/1/3/131379205/4757633.pdfIn PDF document text
    • http://kino-vezde.ru/humboldt_co_ca_jail_reports72cdb.pdfIn PDF document text
    • http://idealica-italiaoficial.site/58209599035nnk8w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496585/normal_5fd12dfd1e2c3.pdfIn PDF document text
    • http://yewes.fun/606552177665eje.pdfIn PDF document text
    • http://mavito.online/1974570338d2utk.pdfIn PDF document text
    • http://maewallace.com/ocho_apellidos_vascos_resumenz63aq.pdfIn PDF document text
    • http://cheeronthemove.store/lenudodiwenumixarefijotukymco6.pdfIn PDF document text
    • https://gupolapi.weebly.com/uploads/1/3/4/6/134629895/daxorelaloma_lawikamopadu_rotap_witogunatagelon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/82977381841.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/straighterline_psychology_final_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/direct_and_inverse_relationships_worksheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 5376 bytes
SHA-256: 729de7b066437a22d31489a56f522c582ba4d31bbd8a8b9dc00b6edf69890137
font_01_sfnt_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 11952 bytes
SHA-256: 48600770bdca87b67d475fe4b9514d2103c5fddccc53ce9b041a67169799140a
font_02_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 16068 bytes
SHA-256: eaa138153142e1b202f6e132b5b79d2ae4483da1523e62d7c19f47fa5ad289e7

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