Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f22afc51117ae1…

MALICIOUS

PDF

82.1 KB Created: 2021-03-24 14:06:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0faee0dc571459750c58b2371c4de904 SHA-1: 9dc841bd717bd1c29e85b6f013321e80ec6098c5 SHA-256: 99f22afc51117ae10085d1a64e0ab1d9f1047b792bc8142d107cd037f36bd71d
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 0.9996

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://gimoguvi.ru/award?keyword=arthur+conan+doyle+lost+world+pdf PDF link annotation
    • http://onlajn-kassa.ru/yugioh_neuron_pcv5mqb.pdfIn PDF document text
    • https://cdn.sqhk.co/nimotixalulo/iBpVjfo/73230425566.pdfIn PDF document text
    • http://qiwi-wallet.online/resident_evil_8_chris_redfield5k7cj.pdfIn PDF document text
    • http://prizinsta24.site/70437050235nds3k.pdfIn PDF document text
    • https://cdn.sqhk.co/lulamekajasu/ajgRLhh/word_craze_daily_puzzle_october_2_2020.pdfIn PDF document text
    • http://wigobike.sportsontheweb.net/breakthrough_plus_2.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzonoviza/cZheij3/56787816115.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/jjdggXz/zig_zag_colors.pdfIn PDF document text
    • https://cdn.sqhk.co/modebopogut/ihiYfjd/lagu_billfold_abaikan_acoustic.pdfIn PDF document text
    • http://jobware.pro/taxaxosapurexabixijls.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namakanexir.atwebpages.com/imagenes_de_caritas_tristes_para_whatsapp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9f16d7-9ff7-474d-9b65-6158845ceef4/bovilodokudupuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dec241e2-030e-4b74-a1c5-321f9c2dcf57/what_is_urban_sociology_and_its_scope.pdfIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_089f47b27bda47b7a26dfc2a1c4cdecf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e04a6a8-0b35-4bac-9a63-7c77dabcc523/ladaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d86d9c-c059-4f6d-8216-29e154e4a747/world_war_z_2_full_movie_online_free_greek_subs.pdfIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_83f0b466523b4fa4a61f852852912497.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7fd20c1-6fb2-4a03-9d28-ca8b8928535a/taurus_g2c_factory_night_sights.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_cf7193e7aace4816a51a3cc062a811e9.pdf?index=trueIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_0ec6e1be040a4ebb89178b82573e0324.pdf?index=trueIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_d9c0f17569704035b56d5e3d41fd3ec4.pdf?index=trueIn PDF document text
    • http://kubomefewofumim.atwebpages.com/cambridge_primary_english_learner_s_book_stage_2.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_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 5424 bytes
SHA-256: 32aa95c7334cce0899d546ea943e406230bbb2b4174d13d4a1777c2d93b652f1
font_01_sfnt_off000112d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 11184 bytes
SHA-256: ca43ba411d37eb9203c4a0815f50515bbb2d8388861bd9c4dac19b6526102665

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