Malicious PDF — malware analysis report

Static analysis result for SHA-256 651ed747db0dd0c0…

MALICIOUS

PDF

77.4 KB Created: 2021-03-24 19:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 970d311a647162927084f0ec6baf428e SHA-1: 5f35df6c51b7dd5ba3287152c7b2f2568f841308 SHA-256: 651ed747db0dd0c02b930f4f81e49532c11489a024ae439c7a4356d7cafa2c03
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://pelibifir.ru/123?utm_term=cartoon+character+wallpaper PDF link annotation
    • https://bopizuvobaz.weebly.com/uploads/1/3/4/6/134668398/8748473.pdfIn PDF document text
    • http://lidlid.xyz/cloud_atlas_review_bookso2u0.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/gggijfQ/fezabujadusedelunokapagov.pdfIn PDF document text
    • http://geloritiveda.mygamesonline.org/the_merry_adventures_of_robin_hood_chapter_3_summary.pdfIn PDF document text
    • https://dobisuji.weebly.com/uploads/1/3/1/4/131454523/611f55.pdfIn PDF document text
    • http://cleanup-sale.site/289158915502lffl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469828/normal_6029b40f05570.pdfIn PDF document text
    • https://cdn.sqhk.co/fukafodifi/eridgiq/reading_iq_app_free_download.pdfIn PDF document text
    • http://reduslim-ufficialesito.site/digujudidabomevir3407f.pdfIn PDF document text
    • http://samozanyat.info/note_20_ultra_release_date_202099f65.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/58472783507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_5fd7dc3a9712a.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/eVhdggV/29102325522.pdfIn PDF document text
    • https://gadevonetikob.weebly.com/uploads/1/3/4/3/134358307/0b0eeb6.pdfIn PDF document text
    • https://domenadonasi.weebly.com/uploads/1/3/0/8/130874365/gubetuzoduf-dobuwefigolola-xaniwaxonoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/jfgcv5J/gediti.pdfIn PDF document text
    • http://lenulari.mypressonline.com/faradedumugejefebiv.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/college_algebra_clep_practice_testgv3gb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421472/normal_5fed5618e0ae7.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/hfide9S/fasazutopuselare.pdfIn PDF document text
    • https://wugusuza.weebly.com/uploads/1/3/4/1/134131733/kivuvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_df7358d2339d45e5bfe6149bac8db11f.pdf?index=trueIn PDF document text
    • http://nubibubimalepik.atwebpages.com/l_orthographe_illustre.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_64f2d4ed9030482099d7c39fa421a48f.pdf?index=trueIn PDF document text
    • http://roveramo.atwebpages.com/how_to_put_bobbin_in_singer_start.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_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 4840 bytes
SHA-256: 25d2e2e67426a27f0143fe64046f83c10448bd33e12122f58447240485763ded
font_01_sfnt_off000103d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 10660 bytes
SHA-256: 4f3f7cc96146d24b3ad84ac568e28a3de16bd44b3e8535ffd663ddce6619c7e4

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