Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4eb6c1c17959f3…

MALICIOUS

PDF

78.3 KB Created: 2021-05-14 14:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9c1f7e5b1814ff660b930b07ec141519 SHA-1: 2c121630a944df8eae04d6e26c3eb8ebf9f9a89e SHA-256: db4eb6c1c17959f33a70753cb3e4f5d5667a0b68d7510f8f5589804846c459fd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to obscure domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to spearphishing.

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://nipisod.ru/strik?utm_term=how+to+pair+altec+lansing+nanopods PDF link annotation
    • http://bukanugizini.mygamesonline.org/design_patterns_in_vb._net.pdfIn PDF document text
    • http://pexarinolal.mypressonline.com/anaesthetic_emergency_drugs.pdfIn PDF document text
    • http://fiwetud.scienceontheweb.net/74229852236.pdfIn PDF document text
    • http://tometifo.getenjoyment.net/terilazajefixogiga.pdfIn PDF document text
    • http://wusozupu.mypressonline.com/bible_verses_about_faith_in_hard_times.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/b094f3f7-432d-49ac-943f-48b8c55d3f37/kuzovefikubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90bdbaf-1209-412d-adda-41f7b9584aa9/is_mercutio_to_blame_for_romeo_and_juliets_death.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd17ae6-60cb-42ad-a5f2-1073ecafcf06/how_to_be_himiko_toga_in_roblox.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/lilirotavipipumedisesov.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/22547363323.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/new_king_james_study_bible_thomas_nelson.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/7844480682.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/junawutalexufavu.pdfIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_a591dbfd22bd492e97da18cb3126c210.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tomaxade/jonufadarafa.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/57388511733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a583cf57-621e-4a89-a690-4d72b1d11306/zipus.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_1780f143b2b742d382aa4144784eca88.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimepusox/73094930576.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/rajewosikone.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/jack_reacher_2_imdb_parents_guide.pdfIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_45cd317953104297951c061c1fcc8ed8.pdf?index=trueIn PDF document text
    • http://sogivuwe.onlinewebshop.net/xekem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86df5bb2-ebaf-4874-a2e4-283e9da66a8e/cuales_son_los_signos_vitales_normales_en_un_adulto_mayor.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_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 5292 bytes
SHA-256: b4c7dd13c93ae2f99ea115ee770954470188d43f78c4935904fdf52e9fb35098
font_01_sfnt_off00010518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 10896 bytes
SHA-256: deef60047dc5bc70070183f93cabcd78e8e64e5f78504c4eb1f6de927c1234cf

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