Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e9b41a63f9612b…

MALICIOUS

PDF

77.7 KB Created: 2021-03-18 00:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5b1ac664a0b025cd4c588cfdf1fa28c6 SHA-1: 9724a34e59612dc00d9bf45133c99721709cad17 SHA-256: 78e9b41a63f9612b8084a31082428d996cf5d14defb3faf9a8a12ec50990e5ca
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 0.9997

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://dugedepap.ru/strik?utm_term=similar+figures+worksheet+8th+grade PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417129/normal_5fcf44242a79c.pdfIn PDF document text
    • http://sale-siberian-force.online/90775655558umn8y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_6046427b425af.pdfIn PDF document text
    • http://ejqy.com/praise_and_worship_songs_list_nigeria64jzi.pdfIn PDF document text
    • http://drawer.icu/matchington_mansion_cheats_level_4446dzo6.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/lLhaJem/time_of_conquest_turn_based_strategy.pdfIn PDF document text
    • http://bujenaro.scienceontheweb.net/39509168255.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/memento_mori_copper_reminder_coinbkfza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410418/normal_604aa87ce57a2.pdfIn PDF document text
    • https://cdn.sqhk.co/xudogafu/doga7ie/game_mansion_blast_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_604f3f0c1403c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502833/normal_60381762e40c2.pdfIn PDF document text
    • https://cdn.sqhk.co/xaduwudixum/8gYwgge/pedasilekafifuligekawawoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ca27ee-7216-45d6-ac48-94e5894dd503/8961212893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e92d7239-97d0-46ec-88b8-dd791fda6b34/45554305680.pdfIn PDF document text
    • http://vajapojaperusu.myartsonline.com/5_love_languages_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5695bef1-2b67-44cd-b4c4-659f1c843444/81198521492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/345b836c-1bc1-4ef6-97f4-da5caa805913/how_to_replace_drive_belt_on_husqvarna_lawn_mower.pdfIn PDF document text
    • http://fupabibenetupu.rf.gd/suva_ergonomie.pdfIn PDF document text
    • http://wusozupit.myartsonline.com/duxawadugedajiditipix.pdfIn PDF document text
    • http://maligufaribez.epizy.com/homemade_beef_jerky_nutritional_information.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_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 5776 bytes
SHA-256: 8d80ff82f665de283a324c3e1470b6a56f0f0f4dc1a645eff6ad7ad0e213972f
font_01_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 10804 bytes
SHA-256: bc4fe52a13928d1234f4f095f3a93a69c54fce57b9afc6c8d049ac42ce64ea3e

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