Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4d39255db55874…

MALICIOUS

PDF

111.0 KB Created: 2021-02-18 00:20:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 470675c7aec47f85a396b888b70e5c1d SHA-1: 775f9924b14c3a0102ced9740a11ace94c8da0af SHA-256: 6c4d39255db5587462003a3fab7ba6061531100c30cb46968ccfb45e071842f5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, many of which point to disposable domains and are flagged as malicious redirectors. The document body, though heavily obfuscated, contains text related to a "Midland - gxt1000vp4 two-way radio", suggesting a lure to trick users into clicking these malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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/123?utm_term=midland+-+gxt1000vp4+two-way+radio In PDF document text
    • http://madamzero.com/xevesorulaj5n5l.pdfIn PDF document text
    • http://morj.space/retugavijolotefuzenawdn3dv.pdfIn PDF document text
    • http://copyright-helps-team.com/amphony_1700_manualdvmwi.pdfIn PDF document text
    • http://expressvpn.store/el_caballo_de_troya_libro_gratisd67rm.pdfIn PDF document text
    • http://maska-respirator.shop/371625146063ammg.pdfIn PDF document text
    • http://milansit.space/top_boss_fights_video_gamese5jch.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/ggj13ig/14490338855.pdfIn PDF document text
    • http://appletopshop.ru/tana_mongeau_nip_sliph141t.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/jX9ghfb/65632514055.pdfIn PDF document text
    • http://freedate18.xyz/capitalization_worksheets_with_answersj9myr.pdfIn PDF document text
    • http://xarusogu.22web.org/apology_letter_template_for_court.pdfIn PDF document text
    • http://vienvozvrat.site/bigg_boss_tamil_season_2_hd26ofi.pdfIn PDF document text
    • http://milano-moda.space/japowotizijamowutim54my.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/ifRgghf/92779466953.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001743c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1743C 5592 bytes
SHA-256: b87e2a5403e2b9e14cca9de9ac50cee0d9e2c68dc534ae65f4ff8c91330ddaf7
font_01_sfnt_off0001878b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1878B 11532 bytes
SHA-256: eb764c1b5e4576786bb93d9c4227f1a726e90ea05816fa83a7d6c77400a3d8c5

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