Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87f2352f0ac9192…

MALICIOUS

PDF

80.6 KB Created: 2021-03-22 10:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 545c7a8f945d47a6fed20a7a840715c7 SHA-1: 2107e18eaefd71173c90048184cc0dabe2c56da0 SHA-256: e87f2352f0ac91923155332fbdf6d9e52fffafaae936878169b1179e7fbc2bb8
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. This is a common technique used to distribute malicious content or redirect users to phishing sites. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=table+design+ideas+for+new+year PDF link annotation
    • https://cdn.sqhk.co/lasesekov/dlajasW/ginger_keyboard_emoji_gifs_themes_games.pdfIn PDF document text
    • https://taretowixulu.weebly.com/uploads/1/3/1/0/131070971/resekovelumudopos.pdfIn PDF document text
    • https://cdn.sqhk.co/peruvereraba/jiXrhao/zesudofi.pdfIn PDF document text
    • http://findattime.com/argumentative_essay_with_introduction_body_and_conclusion_example40949.pdfIn PDF document text
    • http://healthit.space/mefomakiogl6w.pdfIn PDF document text
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/pawifufi-wofunadik.pdfIn PDF document text
    • http://ritual-venki.online/asus_router_rt-n56u_vpn_setupzpqva.pdfIn PDF document text
    • http://pogadai.xyz/how_much_does_a_crew_trainer_at_mcdonalds_get_paididenl.pdfIn PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/manezupowiku.pdfIn PDF document text
    • https://xezixopizanew.weebly.com/uploads/1/3/5/3/135314636/1288881.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d9c73feb-c945-4d97-9d44-ff62a4b57c47.filesusr.com/ugd/12056e_af56449b452542d891a1c5862431479a.pdf?index=trueIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_20e348debabb479b8ab6748749a97fcd.pdf?index=trueIn PDF document text
    • http://fimamuvumurepu.rf.gd/34836100915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6fd5fd-fbf3-4c12-b9d8-0311e3d43f6e/65191793240.pdfIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_2c4428c709af48c58faf47d563ede857.pdf?index=trueIn PDF document text
    • http://mijitililifi.epizy.com/32910981925.pdfIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_61b8e195dcf048208940da40bbe51f8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f13c5b0-0cc2-4454-b467-5190fbf6613a/flowermate_v5.0s_pro_nz.pdfIn PDF document text
    • http://ragobubobog.rf.gd/gs-12_equivalent_military_rank_navy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49803c39-2fa2-4972-9075-7989ed7fe8de/22733264636.pdfIn PDF document text
    • http://fisuwadufojotu.rf.gd/montreal_metro_map_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a77fe9b-da77-4e86-a54b-081229d86f24/3552593503.pdfIn PDF document text
    • http://bizuwututemi.rf.gd/16622845934.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_535e5c44c0774267ab80fd9dc1014c84.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_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 5360 bytes
SHA-256: 029afe8e984fd6e8aacea8eb33e7bde11c4deb2a6d524cb5e4c895c379abb346
font_01_sfnt_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 10832 bytes
SHA-256: 280e632ea232952f00a7a166b997c87a533a4cd5c343eb2e89b9a65f1148d9be