Malicious PDF — malware analysis report

Static analysis result for SHA-256 129ad0a91e0f3725…

MALICIOUS

PDF

76.9 KB Created: 2021-03-22 21:09:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b4c8d7c3605178467ada708ddc3e07b1 SHA-1: 9fa007be5a8e7f050fa797e60d7cd1e6ad17d726 SHA-256: 129ad0a91e0f37256f0eb34da58682812d4104e5887da10a6cd33de6c9e2c97e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=que+es+la+destilacion+fraccionaria+del+petroleo PDF link annotation
    • http://nibajafij.medianewsonline.com/brother_mfc-6490cw_driver.pdfIn PDF document text
    • https://wimaxexuxiwob.weebly.com/uploads/1/3/0/8/130874544/bd2a47dbebd8.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/jecgeij/novozidivifajojuxovawosu.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/hiRgdhc/net_naija_for_life.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/articles_a_an_the_grammar_exercises.pdfIn PDF document text
    • https://rirosivipoxutu.weebly.com/uploads/1/3/2/3/132302830/747890dd291.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/ic6TF1w/cefalexina_bula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8d1681d7-0ac3-41e1-b89b-7dc84c2924f4/51202350818.pdfIn PDF document text
    • http://nuwadolonopip.onlinewebshop.net/83977400764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d63d0fa-fd43-4ab9-97f3-21e41a0ff73f/69185016449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ab3a30-7b3d-4261-b87b-0db24987f3df/sexevajanemavenuxan.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/vafodaduluzebat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe91b8a-24ec-4168-af61-aaf190394a56/58410709660.pdfIn PDF document text
    • http://pasifowon.atwebpages.com/best_air_fryer_recipes.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/isometric_and_orthographic_drawing.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/the_poisonwood_bible_barnes_and_noble.pdfIn PDF document text
    • http://litorow.myartsonline.com/44332160244.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/1987_yamaha_40_hp_outboard_service_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 5092 bytes
SHA-256: 0f3a36faf0dfccd4464aecbc074bc82ba198df48afbdaa95a8fc18f6539f5e41
font_01_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 11940 bytes
SHA-256: 4d8839c08f52060830703edb84b77a4fc0dfec9e5a7709d1e5ff9f9b24211930
font_02_sfnt_off00011680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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