Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5865af14642e2a…

MALICIOUS

PDF

79.2 KB Created: 2021-03-25 22:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d30f411a37f264bcbfd48eb3a80da18e SHA-1: bfd1584edff61cac42cbc951b866e36677f455a2 SHA-256: 9b5865af14642e2ad00b4e9742b1b5d447fdb919123296f546dad67a28cea7bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm indicate a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=what+type+of+coolant+for+ford+focus
    • http://kunepuvobimamin.medianewsonline.com/arqueologia_industrial.pdf
    • https://fozixaxo.weebly.com/uploads/1/3/4/6/134665632/13455.pdf
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/9147389.pdf
    • http://naliputa.mywebcommunity.org/marketing_definitions_a_glossary_of_marketing_terms.pdf
    • http://tibagisuminove.sportsontheweb.net/drte_hansen_altes_land.pdf
    • https://lisopivoxo.weebly.com/uploads/1/3/4/9/134901835/foximupix.pdf
    • http://zevibeponakat.getenjoyment.net/passive_voice_tenses_exercises.pdf
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/f0541329c77.pdf
    • http://gazizelasama.getenjoyment.net/vampire_the_masquerade_5th_edition_core_book_download_free.pdf
    • http://lotefevedajo.22web.org/vernier_caliper_file.pdf
    • https://neriborotarisim.weebly.com/uploads/1/3/4/3/134345051/38aaeccd6842.pdf
    • http://rikuximuvo.iblogger.org/sujogekoxobafip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/betefowubevat/sutanikosokas.pdf
    • http://borinalujid.epizy.com/lil_win_anointing_video.pdf
    • https://9dc8676a-0e58-44ee-a512-e339c7094702.filesusr.com/ugd/7c0652_dbfc07f77f9d49b9a0569d9f30e72192.pdf?index=true
    • https://s3.amazonaws.com/tokit/bombay_dyeing_bedsheet_online_shopping.pdf
    • http://gitodake.myartsonline.com/88294969978.pdf
    • http://rexalovujomorox.epizy.com/67345825265.pdf
    • https://s3.amazonaws.com/dudigonifu/wupesisibomesijovogetepe.pdf
    • http://womepulus.epizy.com/statistical_models_in_engineering_hahn_shapiro.pdf
    • http://bumurulepowele.myartsonline.com/11654399235.pdf
    • https://s3.amazonaws.com/bokelur/2520661915.pdf
    • http://sakogabutal.onlinewebshop.net/38238552051.pdf
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_41658f7eec5144cf8b9a9751d20e2268.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_off0000f860.bin
1204a6be23f16611e15f4fdc153872681dcfd88455d5133b72b071d7630bfe01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 5360 bytes
font_01_sfnt_off00010aac.bin
14e081788ad60a17dedbead944fbb649830e4910eafc756f28c9b018248f0a3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 10864 bytes

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