Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec098dda0013b5f2…

MALICIOUS

PDF

79.5 KB Created: 2021-03-24 09:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0727cf4b57f609c6f48028e429d20872 SHA-1: 530785f48e0298ca6de5872b5ba5fdf2bc4f6ac7 SHA-256: ec098dda0013b5f2615c735fb6e4084224ea093e0bed7b35ec4d7ba0fe06eab3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-themed and point to potentially malicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=solving+equations+worksheet+answers+pdf
    • https://cdn-cms.f-static.net/uploads/4456999/normal_603958c512a2f.pdf
    • http://stileidmo.fun/slots_free_casino_tournaments_us_playersrahki.pdf
    • http://digitalliteracyinstitute.com/167731194226074o.pdf
    • https://cdn-cms.f-static.net/uploads/4425237/normal_602213d9d5b1a.pdf
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5fcbbf4f86ebb.pdf
    • http://bachanalytics.com/somewhere_over_the_rainbow_eva_cassidy_lyrics_azparv6.pdf
    • https://bexopugizabon.weebly.com/uploads/1/3/4/0/134042324/jonanagita.pdf
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5fe907c0e7c21.pdf
    • https://cdn-cms.f-static.net/uploads/4414172/normal_600dfeda03381.pdf
    • https://popofexepazor.weebly.com/uploads/1/3/2/6/132680818/eafb73.pdf
    • https://cdn-cms.f-static.net/uploads/4370768/normal_5fe8fc535614e.pdf
    • https://cdn-cms.f-static.net/uploads/4466172/normal_604b01aa35457.pdf
    • https://bekodezu.weebly.com/uploads/1/3/1/8/131856725/659299cf6fbacb2.pdf
    • https://cdn-cms.f-static.net/uploads/4388629/normal_60332bfa399e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9b3585e2-7b49-4e2b-9f17-82b2e86cc1a1/68586737123.pdf
    • https://uploads.strikinglycdn.com/files/e82816d1-a831-4fbd-a384-93f71ff7b536/fraction_bars_printable.pdf
    • https://uploads.strikinglycdn.com/files/ddf47056-02dc-464d-b49e-3c66bebf2be1/kayla_itsines_bbg_workout_week_1.pdf
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_a36f700ffaec4087b0c122fb7e76412d.pdf?index=true
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_387a8c83b4f74cd79dcca9f609a2ee15.pdf?index=true
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_b369ff152ab04200aab4554576b97889.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40f.bin
54ed330c120e9d27f28406a7fae434afdcba7437cd5ac4608679766d6066d663		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 5748 bytes
font_01_sfnt_off000107aa.bin
256cce63fba8499fd01648e2df4cd48a9d24747c4a214c24ebbf0d349a344cf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 11528 bytes

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