Malicious PDF — malware analysis report

Static analysis result for SHA-256 24683645ba4ccbf2…

MALICIOUS

PDF

76.5 KB Created: 2021-04-04 05:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 106a98a234eea9e2f4961ff695493c21 SHA-1: ca93437cb87c8d240747dec87336b5cac366a452 SHA-256: 24683645ba4ccbf28ad92cebe0c3aea4a1b20e6001dddadc3ad45caa5f0df806
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 0.9991

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://dafemum.ru/award?keyword=hospital+risk+management+plan+pdf PDF link annotation
    • https://cdn.sqhk.co/tezejikibus/fDPBjir/nuclear_bomb_example_sentence.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_6067a0797f446.pdfIn PDF document text
    • http://zinuvudoliku.iblogger.org/far_cry_4_arena_master_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/iejhdji/45287174701.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/hbZgTta/bubble_tea_kit_meecha.pdfIn PDF document text
    • http://rawitotizoxuk.scienceontheweb.net/pudevuzizenupuvinefimunum.pdfIn PDF document text
    • http://fonivoguko.medianewsonline.com/biblia_de_estudio_macarthur_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/DahjygB/bizatakalesesamevubidom.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/cat_verbal_ability_books_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473053/normal_5fd1ff7e6a71f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_605181584ac22.pdfIn PDF document text
    • https://cdn.sqhk.co/kevejonob/hjjchhj/gotusegineweduz.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/pisedij/mipudukezaneliju.pdfIn PDF document text
    • http://dikokek.epizy.com/26919631009.pdfIn PDF document text
    • http://gawekavadave.epizy.com/43722137964.pdfIn PDF document text
    • http://vigiraporonom.rf.gd/characteristics_of_good_marketing_research.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/miripivujivuvoxafanijixej.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/abramovic_performance_artist.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/xowakoronamiruwik.pdfIn PDF document text
    • http://zenakezogutomu.onlinewebshop.net/jatitodamawupelataw.pdfIn PDF document text
    • http://dodavofonov.rf.gd/benefits_of_cloud_computing_for_small_business.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/bad_blood_book_turned_into_movie.pdfIn PDF document text
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_cba5218d3c2042e688c6f6a9d9df5aa2.pdf?index=trueIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_af3a8c656f80478f8edb695c222bbc64.pdf?index=trueIn 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_off0000ee8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8F 5388 bytes
SHA-256: 324a76e7481be067d18b2d3d5468b70b28e018c90ed9894be4eaed07d86c302b
font_01_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 10536 bytes
SHA-256: 79a63b3b0b849a365d370e35f1c9dc9ab1a9d624b327aee7c3584ffd7a6df2b2