Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de1af0665dfad67…

MALICIOUS

PDF

82.8 KB Created: 2021-03-09 12:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6356af33c03ab3a63ea103c20a126394 SHA-1: 61f68a7385a0a2bbfd694f11283f43dc04ea552d SHA-256: 7de1af0665dfad67afd4f5052d8a9074d22fa7d40d47acee2e7166965974a731
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the primary function appears to be directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://mezovuduw.ru/award?keyword=power+amplifier+basics+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385038/normal_5fd7261b8a0dc.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/hhhjejj/dish_anywhere_activate_roku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466166/normal_5feaebf770720.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/54670940616.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/can_you_check_your_drivers_license_status_online_uk.pdfIn PDF document text
    • https://giximanuv.weebly.com/uploads/1/3/4/5/134526051/fozakivibi.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/ghagjfb/pcs_card_recharge_votre_carte.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_603cc2477fbdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413469/normal_6031e8de2fcd7.pdfIn PDF document text
    • https://wexubowepupewaw.weebly.com/uploads/1/3/1/8/131856394/7133453e3e8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457302/normal_600138d8c4835.pdfIn PDF document text
    • https://xovirekines.weebly.com/uploads/1/3/4/6/134648888/07c25c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466161/normal_60226ee62543d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_603873e9d902d.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/ib4QaTw/my_att_directv_bill.pdfIn PDF document text
    • https://zirorimasarikar.weebly.com/uploads/1/3/4/1/134108573/xedamezatif.pdfIn PDF document text
    • https://cdn.sqhk.co/nisisepolo/sjdifih/titan_360_slot_machine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501789/normal_5fd9133c3455d.pdfIn PDF document text
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/wadusisa.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/bJZijfA/83605166776.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468286/normal_5fddd43bd548f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_19c58276689f4e65876b6b7c5eb59ab1.pdf?index=trueIn PDF document text
    • http://gosaduzunake.myartsonline.com/how_can_i_check_my_check_engine_light_code_without_a_scanner.pdfIn PDF document text
    • http://kebenubes.onlinewebshop.net/jubalulem.pdfIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_6dea7daf759e40eaba5787845a936cd3.pdf?index=trueIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_f864da16e276458c8665da1941c7a9b3.pdf?index=trueIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_1d2467d659fa41f7bf3852da47ecaed1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 5532 bytes
SHA-256: 9188a9188ef021a8b1deef4de17a3bbc9aeb6267920a23d0e344f7b2d23d1ed1
font_01_sfnt_off00011846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11846 11008 bytes
SHA-256: 77d43d535fa5f9e3b9c245c18a1a539191d549248a37671c5f4a4575ace9627e