Malicious PDF — malware analysis report

Static analysis result for SHA-256 af78709439a54b8e…

MALICIOUS

PDF

89.3 KB Created: 2021-04-06 05:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 08cf19952ada672cf4f11db67e3293c1 SHA-1: 98a61cd87a908e476a0be51009ed060d2f9b1f11 SHA-256: af78709439a54b8ee3f55db101f0e46761b78db9d6697aebe68ad088b2bdd147
126 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 0.9993

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
  • 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://jottigo.ru/wix?keyword=lesson+6.3+arcs+and+angles PDF link annotation
    • https://cdn.sqhk.co/fowipovoji/gihg4ig/15065048920.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5fe349617bfb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476924/normal_5fe73663e787e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_5fd175ff9bc29.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawitaxug/KicijyB/catfishing_gear_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxifobiro/hsVirhi/property_settlement_agreement_template_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/jaruxabal/8JbDdJ5/62224817525.pdfIn PDF document text
    • http://coolvdomaion.online/world_of_greyhawk_wikiwuxca.pdfIn PDF document text
    • http://fb-ig-copyright.com/vatolexegexojwrnl.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/ij2Xyja/best_emoji_keyboard_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_6036dd6a5c891.pdfIn PDF document text
    • https://cdn.sqhk.co/xudadidi/xErijgj/35209132167.pdfIn PDF document text
    • http://huaweistoreukr.xyz/how_to_make_cajun_pasta_sauce_from_scratchtljjo.pdfIn PDF document text
    • http://like-store.site/what_is_the_best_phone_for_seniorspnt87.pdfIn PDF document text
    • http://allerlo.xyz/what_does_the_color_orange_mean_psychologicallymoy3o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dusexere.epizy.com/i_a_maron_calculus_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/jurawenijutejif.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/48119772822.pdfIn PDF document text
    • http://notufexunu.rf.gd/lei_simples_nacional_2020.pdfIn PDF document text
    • http://fosufikitovirir.rf.gd/90630477862.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/vibirunat.pdfIn PDF document text
    • http://viminug.epizy.com/7073603155.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/40277726336.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/hp_photosmart_7510_ink_walmart.pdfIn PDF document text
    • http://sajipesexadagon.epizy.com/batman_begins_theme_music.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_off00012008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 5400 bytes
SHA-256: 3cb9007123101146f54a75462bddf15d7e674c5f31a9e23063114fb97b599bec
font_01_sfnt_off00013273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13273 10956 bytes
SHA-256: bc56fcdca4ab4808e6bdeee065e7288f76f446943cac7dd1ebb13c6b6b9acc3b

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