Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b49b5a61c2741f…

MALICIOUS

PDF

97.7 KB Created: 2021-03-09 05:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: ba48c998ed739b2f30ceb02fe7af5085 SHA-1: 6745021a386d8ed55bb430d63f8709578ce211d8 SHA-256: 98b49b5a61c2741f733ff0a3aa222ff43e0ca01ff5e2081d26e5c6254c83ec0a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://leonvi.ru/strik?utm_term=what+is+the+balanced+chemical+equations PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389599/normal_600ff30688bb0.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/ae973e.pdfIn PDF document text
    • https://zivujibu.weebly.com/uploads/1/3/0/9/130969332/82c8d399040f.pdfIn PDF document text
    • http://thrivewebs.com/zoo_biologia_del_dr_adambwdgi.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/motepi.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/vasitesebojubowo.pdfIn PDF document text
    • https://lifezudo.weebly.com/uploads/1/3/0/7/130739479/6f6a4b525.pdfIn PDF document text
    • https://vagenovujod.weebly.com/uploads/1/3/1/3/131398358/kafes_zevumoti_vilupujon.pdfIn PDF document text
    • http://requiremcgood.com/8_mile_putlockerjrkvv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403556/normal_5fdd654b9dd6d.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/vazoroxetoxiduxi.pdfIn PDF document text
    • http://kutejovanog.getenjoyment.net/2355313187.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_634d707c282e4f81a2e527c3037270c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dusined/hospital_management_system_template_in_php.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_933c67dceb7a4692ac853f2cf8879ef6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/hernia_abdominal_en_gatos.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/amazing_grace_gospel_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/flannel_sheets_queen_kohls.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/1309750416.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off00011831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11831 5360 bytes
SHA-256: 4abe4d7ca777cb3526a3898d9cc75f42e3c8263c4c435b84ed03f584329aceb4
font_02_sfnt_off00012a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0F 6300 bytes
SHA-256: fba9f6d5d467b7d6bbccdc8ac95b73ea8a6825a62cfb156e50cd914bb525142d
font_03_sfnt_off00013968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13968 12164 bytes
SHA-256: 547366e2898702e380b2810049d22702101c7b125e34dd857336003c7e81d1e8
font_04_sfnt_off0001626a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1626A 16304 bytes
SHA-256: 2224c944449b015029e41aa295be737576f179692b4ced6056ec3a2810dc06e1

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