Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc04ddd708d822b9…

MALICIOUS

PDF

76.0 KB Created: 2021-03-16 00:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6f0d8fd8cc4c0d34474bd097d24d2e14 SHA-1: b99dff03c5bb0597b349c67742d2e2da64011c20 SHA-256: bc04ddd708d822b9e19aefa0f265c7fa8c91f49f2ca50884ab02db7046042c07
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of small PDFs on disposable hosting, reinforcing the malicious nature. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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://seumenha.ru/award?keyword=how+to+boost+self+esteem+pdf PDF link annotation
    • http://girlsbeach.space/relikaluzer8uwxq.pdfIn PDF document text
    • http://allwoman.site/skyrim_se_mod_list_1.1ul3tm.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/bodybuilding_food_nutrition_chart.pdfIn PDF document text
    • http://cozyplacefor.rest/jajegipatasexabowokoraoub8e.pdfIn PDF document text
    • http://agent-ritual495.online/fipazojexolexumuwemyvhfl.pdfIn PDF document text
    • http://ketousa.site/what_is_reflection_coefficient_formulaa2cte.pdfIn PDF document text
    • http://pegijegur.mygamesonline.org/masunusufi.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/36250701341.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/4209573011.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/Vjhnhje/38625656619.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/Kb2ggdf/76287115280.pdfIn PDF document text
    • http://coins24h.com/lotuveletvh2sw.pdfIn PDF document text
    • http://fortysgjdk.fun/how_much_does_a_lifetime_sirius_subscription_costvytcd.pdfIn PDF document text
    • http://bidimiw.sportsontheweb.net/vaviduwigifesosomirebo.pdfIn PDF document text
    • http://groby-ritual.online/jegelolumakedogidixosoi9p1h.pdfIn PDF document text
    • http://mmamba.ru/milukejuregeramogemoj812jd.pdfIn PDF document text
    • http://ig-mediateam.net/libra_shqip_freeqt860.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/5f1cb36e-d375-4020-adcf-e8baeb3ced3e/murematedeseduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d1cc5b-d7a8-4112-91fa-9cc67c293e8d/toto_washlet_c100_review.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/lumakog.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_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 5076 bytes
SHA-256: d7b054520a0eb5937e6fc0ee532d25809c35a169d3753d95159d031e2b6bf568
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 11088 bytes
SHA-256: 870149ba0722d5ad0de0bc94d537a4766579c20ee86a44fb0036e7b658313409

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