Malicious PDF — malware analysis report

Static analysis result for SHA-256 befcd8556452f8f1…

MALICIOUS

PDF

79.8 KB Created: 2021-03-11 07:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b227b547a35e678151e47c86fca9f78a SHA-1: ded2d20b449b40eea64c713dfaf6823cf43f6a2a SHA-256: befcd8556452f8f1bbcf6c9a2a8bc32a03e55a18962ad4dae2070b2332ac691d
186 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/strik?utm_term=sony+xplod+amp+600w PDF link annotation
    • https://cdn.sqhk.co/wokowuvawuz/idbihgd/38944449045.pdfIn PDF document text
    • https://cdn.sqhk.co/vabadoma/5icLibI/scorestream_high_school_basketball_team_rankings_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/ifhhryo/pizokiginofigesapuxi.pdfIn PDF document text
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/1309695.pdfIn PDF document text
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/tapuwesalo.pdfIn PDF document text
    • http://suvipigodu.iblogger.org/texas_gulf_coast_fishing_guides.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/jjb1jan/milkchoco_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/d6jbjah/2nd_degree_burn_healing_or_infected.pdfIn PDF document text
    • https://joziwofu.weebly.com/uploads/1/3/4/0/134012586/5649080.pdfIn PDF document text
    • https://waretopaze.weebly.com/uploads/1/3/4/5/134529701/nimip.pdfIn PDF document text
    • https://cdn.sqhk.co/sebazisop/2WmhjO2/45099181508.pdfIn PDF document text
    • https://junezemojevav.weebly.com/uploads/1/3/2/7/132740237/112129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481285/normal_6020714e2a876.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/ecGhhiH/nfl_playoff_picture_week_13.pdfIn PDF document text
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/3048084.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/8569024.pdfIn PDF document text
    • https://vizedaxitexoter.weebly.com/uploads/1/3/4/7/134740617/fipivo.pdfIn PDF document text
    • https://cdn.sqhk.co/sumavevop/iaRd0ms/vajolinom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_5fd1decf25ad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_600d377758a96.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/8wyWifn/font_awesome_cheatsheet.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://torumaxot.rf.gd/cursive_letter_r_practice_worksheet.pdfIn PDF document text
    • http://welidigukiru.epizy.com/cite_this_for_me_harvard_guide.pdfIn PDF document text
    • http://wiwilewito.epizy.com/zoxugapibop.pdfIn PDF document text
    • http://jemoxojuv.epizy.com/50940342782.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_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 5032 bytes
SHA-256: 183a882e425cb324c2f7f15d60dbf0fd675bd874d3824741ca25d5f9e925e6c7
font_01_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 11000 bytes
SHA-256: af3390fe80aba96b1457d13c621da557acb3ef026e2d64699614e1078bc7a861
font_02_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71