Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f893c1e9b2b024…

MALICIOUS

PDF

89.7 KB Created: 2021-03-25 04:18:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0a90672dc5a77b69a9af085a02f20530 SHA-1: 9c9b2834383045b613fdcc67193cfb57a82294e7 SHA-256: 40f893c1e9b2b024d0b8dafe7f2036d18b17001560d697f5d7c61a8d9b3457d5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9985

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://botokaw.ru/strik?utm_term=little+house+on+the+prairie+season+5+episode+6 PDF link annotation
    • http://batut.space/naruto_blazing_apk_iosgtpzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413703/normal_5fdc7d276783d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_6046a50a1a165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_602cfb6928495.pdfIn PDF document text
    • http://wosozage.mypressonline.com/70510507600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_6041f3c87cf91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_60127a1f1793b.pdfIn PDF document text
    • http://zdorovienashevse.xyz/nevujotutr4rbm.pdfIn PDF document text
    • http://remont-pc.website/xamexutunafowasubiwosoo7.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/nofefunesedafij.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/is_dynamic_tension_good_for_building_muscle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/manual_caja_registradora_casio_pcr-t280_en_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/570901118.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_e51f170975f344959121a9712329731b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/xulegudexapuwekibir.pdfIn PDF document text
    • http://tozuduxaxikagik.rf.gd/epson_artisan_1430_clean_print_heads.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/35236185964.pdfIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_649fad7f44d84ea38dc0d884d074ccd3.pdf?index=trueIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_21bf007edbd74421840c216dcc8753df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/casio_ga-100_lyrics.pdfIn PDF document text
    • http://volififujuwimi.epizy.com/cuales_son_los_beneficios_de_la_planta_romero.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/sixufevimamil.pdfIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_ab40eb79e0324ca4acfe01c12b49bbef.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 5148 bytes
SHA-256: 89b4609d05617c42c21ad1c0d429750aaa299079ecb9172bbc2ca4e17aaa79f2
font_01_sfnt_off00010bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC6 10976 bytes
SHA-256: 4c04910ca1a40a38ab259df1cb1326c455248685e590e8bca3806ab33b5dc877
font_02_sfnt_off00013129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13129 17484 bytes
SHA-256: ff80b801dafac7c72ec8756d643d63f0f4546c249a5eaacdb0e944e79493a781
font_03_sfnt_off000148c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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