Malicious PDF — malware analysis report

Static analysis result for SHA-256 63affaa6a73d03f1…

MALICIOUS

PDF

73.6 KB Created: 2021-03-08 08:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9135561e034c29bef8d82ca933b4808f SHA-1: 7f2e19fb01281ce721f99b0f478581e1a6f0e5f2 SHA-256: 63affaa6a73d03f1d07bcc0bef08e8b78aa2bf912b6e4e54c5b6d42667efab83
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points towards the execution of JavaScript to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/wix?keyword=once+upon+a+chef+crab+cakes PDF link annotation
    • https://cdn.sqhk.co/migukosodaza/ZjaXigg/wekatesepipudaloligowaxu.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/felowiritefasuxal.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/khahhh7/42175411810.pdfIn PDF document text
    • http://liginirudusupob.22web.org/aluminum_sheet_metal_gauge_to_mm.pdfIn PDF document text
    • https://cdn.sqhk.co/woferomot/hhFifha/how_to_make_origami_flowers_with_rectangle_paper.pdfIn PDF document text
    • https://cdn.sqhk.co/sisowufabo/Iq3jgji/video_calling_samsung_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/ihPha1G/diba_true_west_haven_tan.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/norcold_refrigerator_quit_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_fed9bdb942fe46dfbeb882e44ae28cf5.pdf?index=trueIn PDF document text
    • http://milifarininigo.rf.gd/golipe.pdfIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_5bac73a61e2247f5a4950b19c617f3d2.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_673ed5da0ff64b15be2740f27087815e.pdf?index=trueIn PDF document text
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_25ef39cae1424f5a88e4903212844473.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_d8a5cb96627b41a9b379b9bafeccae08.pdf?index=trueIn PDF document text
    • http://davinawoguzag.atwebpages.com/48171217831.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/how_to_become_a_certified_eyelash_extension_trainer.pdfIn PDF document text
    • http://tawenaxogiminax.epizy.com/vigufareku.pdfIn PDF document text
    • http://judewal.rf.gd/63728707952.pdfIn PDF document text
    • http://padavitapep.epizy.com/dyson_ball_dc65_animal_upright_vacuum_cleaner.pdfIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_a2fcdb79b14a4051bef4272cf0087b20.pdf?index=trueIn PDF document text
    • http://laxukumelukadut.myartsonline.com/asus_ac68u_firmware_upgrade.pdfIn PDF document text
    • http://tirisesu.onlinewebshop.net/94297742676.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_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 5300 bytes
SHA-256: 50dd832f3bffd02547b5895231f183de1ea6f20d487e1d7535ad9ae630aec1c7
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 10016 bytes
SHA-256: 7885255bd6aca4f9f0b3c317513c880af36c427811252e8cf28a5a84e1e388c5