Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e78bd87b9bec7f…

MALICIOUS

PDF

66.5 KB Created: 2021-02-25 18:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 43f775151bd70ca3a24f35718a1bec07 SHA-1: 5b5049ac8751b2c3efd6c0528a27747593484e40 SHA-256: 79e78bd87b9bec7f20006cf3d5bb561b822295a5cbef3bb9adc00ac2f2f6eca9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://druttle.ru/wix?keyword=insignia+dual+hard+drive+docking+station+how+to+use PDF link annotation
    • http://fajujefa.getenjoyment.net/89522065467.pdfIn PDF document text
    • http://goxoxitinewowim.22web.org/gapudavomavawokozafa.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/11945653007.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/13465968648.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/32697216495.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/90550519528.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/74139503373.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/sword_art_online_alicization_lycoris_update_1.11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/bibezenirilovijowifo.pdfIn PDF document text
    • http://juzavogubi.rf.gd/demixonasaziwe.pdfIn PDF document text
    • http://topemuzopapegu.epizy.com/dolce_gusto_coffee_machine_guide.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/dewalt_drill_driver_set_80-piece_dw2587.pdfIn PDF document text
    • http://wotonopeg.epizy.com/96986855256.pdfIn PDF document text
    • http://naremijex.epizy.com/best_tool_music.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_off0000c823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 5352 bytes
SHA-256: 75fbe6365dc8d9d822a0eaaff4acfe151025f3db8f98b5de7f3b0026b25c7511
font_01_sfnt_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 10076 bytes
SHA-256: 213e765dcf4540ea9fff2e4e25d11190467a4f3e25ec43edc2b6e470080f97c9

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