Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01703a554219edb…

MALICIOUS

PDF

72.7 KB Created: 2021-03-25 02:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6009ec4c2f76d205a4d32152a7d4c24 SHA-1: 5e753c84aa2f3656f8035664c77d393eef372520 SHA-256: d01703a554219edb05f95cf892e7a2d2d7a76cf156784b96d8ac1cb279c94deb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://seumenha.ru/award?keyword=asthma+nice+guidelines+pdf', suggests a lure to a potentially malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution, aligning with the Spearphishing Attachment technique. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards malicious content delivery.

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://seumenha.ru/award?keyword=asthma+nice+guidelines+pdf
    • http://infonewsuk.site/sedodugomonusupolofemow51.pdf
    • https://jexedijelewa.weebly.com/uploads/1/3/4/5/134518212/xetaluvatifozijusis.pdf
    • http://thedopemarketing.com/305011619977qk6o.pdf
    • http://smartcreditcheck.info/lana_del_rey_video_games_joy_orbison_remix2ujw6.pdf
    • https://jekowidemovo.weebly.com/uploads/1/3/4/7/134702183/ca3b69e48340151.pdf
    • http://tells.fun/99936186692isyxy.pdf
    • http://makedctl.site/lutezctb8s.pdf
    • http://counterman.ru/24670121355u09t3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4ac71481-edfa-4624-815d-51b705cfdc73/tesebimibuwujuravogow.pdf
    • https://uploads.strikinglycdn.com/files/e8ca9e0b-044e-4022-bf48-ba579a0796e1/sparknotes_merchant_of_venice_act_2_scene_4.pdf
    • https://uploads.strikinglycdn.com/files/2e827cd3-0027-47dc-91d5-1440d38605cf/power_holdem_strategy_book.pdf
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_059be6ea80d44193adbba5ab907a7dd6.pdf?index=true
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_13ecf4e3a25944d58325422870efb887.pdf?index=true
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_eb64c2a4ba58412bafcbe0bec87498a2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/790a082f-4c18-4680-a297-38978161352c/15282302830.pdf
    • https://uploads.strikinglycdn.com/files/479778bc-6a34-4e63-a4f6-60ea53a95871/common_linux_ubuntu_commands.pdf
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_49cc46cc6bc041398d8d6d3d289cb617.pdf?index=true
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_04d3b43793524a0ab5bf21a164fe5edd.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_off0000e090.bin
b04c75e687356acb1d01c7942321ee30efb33ea45e72211f6bbfdebf89e71803		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 5464 bytes
font_01_sfnt_off0000f304.bin
1fcd15c11c235ccc9debcc40951a0c62ac9a688b9e784495260bb14e8cabd67e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 10248 bytes

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