Malicious PDF — malware analysis report

Static analysis result for SHA-256 07878794846f4780…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 18:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a73eec9422af6abdc02d79066e03344f SHA-1: b1892601eb5398af8bca6831db81a4216a126377 SHA-256: 07878794846f4780da1495e4dee8d6a7943d9137e8a682b30c740df03f9a5643
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=drenagem+linfatica+manual+fisioterapia+pdf PDF link annotation
    • https://mehreganimaging.com/images/upload/files/boxolitomaxojarimukidaguv.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/kofupogazonofizitisanep.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/diwabigonipu.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/rewibepuwedibuvap.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/96092640175.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/32a19246a8bcacd045308e4f50e2d134/51722023294.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/dopofifulojub.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210902_0C8A8DBD04455247.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/69161625513.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/nuvasuwuwupoguluninako.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109011802224321.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/toratexivomeviravisewa.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/kululotujoli.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/39818595694.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/fonukop.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/73053425699.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/bamefimudosawivapix.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/15729943266.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/69899392158.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/karakuruj.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/kuzawemutavugilumorexo.pdfIn PDF document text
    • https://aashianarealty.com/file/forubimega.pdfIn PDF document text
    • http://erex.hu/upload/file/2943282109.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303d6450749---71702504320.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 17848 bytes
SHA-256: 80b71c0c08f83d735314856023a547315bb996788221d5ebd4bc5a49dc62f66e
font_01_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 11064 bytes
SHA-256: 783e2480e8e6aeb39787cea5bf78b5ec29b84b98f3c1e6424af7bdfe045c5b9a