Malicious PDF — malware analysis report

Static analysis result for SHA-256 48965884b1b6df98…

MALICIOUS

PDF

73.8 KB Created: 2021-03-20 08:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: eddb8ca1f1aac6509f81074fb1e18007 SHA-1: 484bd5bd37bf2210bad5fd8f491cbaf1948c1ed5 SHA-256: 48965884b1b6df98cdbaad1d90de362ebb13d03dbda94d17eb009979ae21af77
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://zajinet.ru/wix?keyword=defend+your+nuts+mobile PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405950/normal_6018881cecb9c.pdfIn PDF document text
    • http://my-favshopg.online/the_adventures_of_sherlock_holmes_season_2_episode_6xyixg.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/kiluwodetaranadabanow.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/42740502669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_603f5d560fc41.pdfIn PDF document text
    • http://ig-supportcenter.xyz/pretest_internal_medicine_13th_edition_free_downloadco8md.pdfIn PDF document text
    • http://itali-big.space/naruto_ultimate_ninja_blazing_ninja_road_guide6om9a.pdfIn PDF document text
    • http://fizebiredasibi.mypressonline.com/bohemian_rhapsody_film_script.pdfIn PDF document text
    • http://bevamifugidujew.scienceontheweb.net/caitlin_moran_how_to_build_a_girl.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/fuwawibu/australian_tv_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78789ab1-7ddc-433e-b75f-04e1b399c5cb/m_audio_axiom_air_25_driver_mac.pdfIn PDF document text
    • https://9dc8676a-0e58-44ee-a512-e339c7094702.filesusr.com/ugd/7c0652_cdfed7d9deb046279cac64cabd679aab.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_e2cc4b1f4b5e42e48926f1469ca136b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e783d23a-b052-478e-9474-09989b276fe8/paige_vanzant_professional_record.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/lofinokoteb.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/bacteriology_short_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/4297881577.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/cryptography_and_network_security_lab_manual.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_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 5084 bytes
SHA-256: 6c3606c986f049e17ba83a48bc9dfe17749845c3e74faeaaa062a0be2c01c2a5
font_01_sfnt_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 21232 bytes
SHA-256: a613dd8047c2feb16405d702319661a6d01de308a8c102fe03fbcce331eac962

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