Malicious PDF — malware analysis report

Static analysis result for SHA-256 4858be249fa54689…

MALICIOUS

PDF

78.7 KB Created: 2021-05-31 10:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cb30eb231c26578c9960f5841918d9cb SHA-1: ceff0d743a2acc46ad6eff1a97e3125612d88727 SHA-256: 4858be249fa54689ef1f150134dc286a5d8026666fef6ced50e8ca88ca71b20d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded external links, with the primary suspicious URL being https://ponafet.ru/strik. The document body is heavily obfuscated, but the presence of numerous links suggests a potential phishing or SEO manipulation scheme. No scripts were extracted, but the PDF structure itself is being leveraged to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/strik?utm_term=who+is+tessa%2527s+dad+in+after+we+collided PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383128/normal_60462234373bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_605cab59b9d9e.pdfIn PDF document text
    • https://vulewerogoxo.weebly.com/uploads/1/3/4/5/134507491/0666ccab3b89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_605cc3cf491e4.pdfIn PDF document text
    • https://medirabo.weebly.com/uploads/1/3/4/0/134040550/ad6748.pdfIn PDF document text
    • https://lurusavi.weebly.com/uploads/1/3/2/7/132710630/riwuw_dodegub_kuvoru_kexativeviwagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501037/normal_60559d94b3695.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387712/normal_5ffc3412bac61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402000/normal_6066651835413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379606/normal_5fd33f043feaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_60468e4b06dee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_5fe66b6be2e65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_6051dd811082a.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/50075e95-2b71-4578-9740-0fbe8172854a/is_canon_200d_worth_buying.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bfeeebf-e3f3-4a03-873e-2af65633a120/neketasagaxadosane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ce6499-2056-41e8-97dc-51de94975182/list_of_coordinating_and_subordinating_conjunctions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4278183d-da56-4928-a36f-7e598d453c0e/15256012494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c6e99ae-44ff-4eae-872d-af5318bc02ef/36036893287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea7f1fc-4464-4572-b0da-cc6a87a713d5/what_weight_should_i_be_bench_pressing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cecd6d1-f398-4f66-9b69-fa21fc9daf9f/72726586847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e01d1a-8db8-46ec-8d38-df794ef3fbc0/zevogama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a4682c-a430-4732-a72f-b30e3859d20c/why_is_my_dvr_not_recording_spectrum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3308090-59ad-4cbb-a154-06306633a4a6/feliz_navidad_song_lyrics.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_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 5248 bytes
SHA-256: f2e5fd051dd6010abd77bbd3b3bb5ce6e996280484857083598b868ae21b1f85
font_01_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 10868 bytes
SHA-256: 40f6f4bae2063fbd6d5730ff70d382c3084be927bda97b6db0b8d220c98a6c27

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