Malicious PDF — malware analysis report

Static analysis result for SHA-256 655747f0fa91edf5…

MALICIOUS

PDF

88.0 KB Created: 2021-05-11 18:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 85906e9983bfada85bf3202b041e6eb0 SHA-1: be9c8b54b0e2b031e45e29122804fc2b67af72f8 SHA-256: 655747f0fa91edf5cd4d44374e6c67d72a34a0fb1a7be693deacf511b10dddf8
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness. While the document body is heavily obfuscated, the presence of external URIs and the PDF_SEO_LINK_FARM heuristic point towards a phishing or content-serving attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gimoguvi.ru/strik?utm_term=how+to+make+clothes+glow+in+royale+high PDF link annotation
    • https://tesebajaja.weebly.com/uploads/1/3/4/4/134402558/togisezuxokuvaj-zowolegoseveju-numuguzotogu.pdfIn PDF document text
    • https://cdn.sqhk.co/bisegepamitu/iyhd2gg/snow_goggle_lens_color_guide.pdfIn PDF document text
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/6854305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_6018074464c48.pdfIn PDF document text
    • https://gakefutafo.weebly.com/uploads/1/3/0/7/130739004/kegiso-sasegugisasudit-ribofekinof.pdfIn PDF document text
    • https://cdn.sqhk.co/lowanivari/SNhjPhj/dabangg_2_songs.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/c6566.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/jJlRjiV/80300536253.pdfIn PDF document text
    • https://videxopejevis.weebly.com/uploads/1/3/5/3/135333638/fe3a48.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/QOWgghb/temple_run_2_lost_jungle_download_uptodown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_601f9d94cb87a.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/h6Ggiha/kurokepodujasigugozoweput.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/722e29cd-dcee-49d3-b508-de892c77f785/padi_open_water_book_buy.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/72333760962.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_5792072e11944ffa861a861153c766ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/bugozizubagisidevize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5266f5c8-0f50-42c5-9422-ed82e36a1ad6/simpson_3100_psi_pressure_washer_oil_change.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/46833602186.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/what_are_the_false_gods_of_this_world.pdfIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_a58ca10bbeb8457b9a3bf88f572d66b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/557fa044-8dd6-4027-9e5d-891cc569b9ed/daverixime.pdfIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_d33e935e47764db5ba630ec0303eeca6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/constant_contact_mobile_friendly_templates.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
    • 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_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 3188 bytes
SHA-256: f6acfabf108fe60970eb6fe0895518fef38b88a01a5834072a4dd85fba9ea242
font_01_sfnt_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 5432 bytes
SHA-256: 070d8349152e4bbb6769318524a006a6efac47191886770c74311b4f7306add9
font_02_sfnt_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 11092 bytes
SHA-256: cbece6ce52df295a4abfe251129994104f74e6f0d26cab5863f7263f70b2bda6
font_03_sfnt_off00013bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC9 16316 bytes
SHA-256: 4a868ad539a19a8d530fb4bdf7fbd2d117fd157d27f8f1851f978a4ae9e2e6de