Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed0d55294bec9fc…

MALICIOUS

PDF

82.0 KB Created: 2021-05-12 15:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f46ad455f936c15e24877445786c731d SHA-1: c786ed0fd11d30d12246868999bfa4758f1b357a SHA-256: 8ed0d55294bec9fc737f9e9ef16f0239e4b7038672cb510f0ff2e7c0f0b51f5d
186 Risk Score

Malware Insights

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

The PDF document contains a high density of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/strik?utm_term=introduction+to+operations+research+9th+edition PDF link annotation
    • http://mevesepegubisis.scienceontheweb.net/city_of_thieves_benioff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461770/normal_6062982c5dafe.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/movabefeti_midotitu_mulatawifitevox_befijirovizi.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/46750687637.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/64067222520.pdfIn PDF document text
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/1cabc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392451/normal_5ff01c8624a4f.pdfIn PDF document text
    • https://wazawuxara.weebly.com/uploads/1/3/4/7/134762715/a6fd9e2ad4f54c.pdfIn PDF document text
    • https://tepaxomiro.weebly.com/uploads/1/3/6/0/136019937/e748d080544f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://larovitivejel.atwebpages.com/guide_aviculture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb6fc1c7-271c-4902-8a60-1527291e4cc0/50138703582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41fad421-bbb7-4238-93e6-eb17f2aa5b7d/69125966606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78bdf69a-74ad-46a5-b4cb-688e4138a9ce/7818639849.pdfIn PDF document text
    • http://xakosafejel.epizy.com/mumanewosomeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d92b3bb9-c36e-4340-b4a9-114b90415eb4/jamutedixazuv.pdfIn PDF document text
    • http://zufonokimilije.epizy.com/sapelokiwidubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10af96e1-d6e6-4e2a-9236-3c6d5e5d4db9/metaphors_in_romeo_and_juliet_act_1_scene_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2531473a-c65e-4567-bac9-6b66f77db616/lexile_reading_level_chart_fountas_pinnell.pdfIn PDF document text
    • http://foduxidepozipiw.myartsonline.com/pegejigavul.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_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 5224 bytes
SHA-256: db874bcb4b190e3859449fe22145857af1eeef0aa7b0bf2b5ae1bf2ee9a621b1
font_01_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 11648 bytes
SHA-256: df0f3cd08b12680e61ff87d7b451266a01acb7ca96eee838563e20fba9ad2847
font_02_sfnt_off000123a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 16084 bytes
SHA-256: 6793135c9d5f2d9402216549edf66541f87ac1c2d7f717693568b2625ec966b3