Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbe36dcd5117a09…

MALICIOUS

PDF

77.4 KB Created: 2021-03-23 17:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d8393f4df4f97dcbd276b381f0fa517 SHA-1: 2c2712598407557fd7e4e9e9f858f82f5bb1f39d SHA-256: 1bbe36dcd5117a09d3c824b94abf2a9c83f178c44186e5eaa27a51a6ff660929
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or phishing attempt. The primary URL, https://seumenha.ru/wix?keyword=parametric+equations+worksheet+algebra+2, indicates a lure to a website that may host further malicious content or phishing forms. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/wix?keyword=parametric+equations+worksheet+algebra+2
    • https://kavuxidawikux.weebly.com/uploads/1/3/4/0/134000359/9544230.pdf
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/98251.pdf
    • https://dazutexigamufo.weebly.com/uploads/1/3/2/7/132740900/1d4c5eb3f55.pdf
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/gageroturaxudim.pdf
    • http://towilevelogefok.22web.org/11574300883.pdf
    • https://zojozonamu.weebly.com/uploads/1/3/1/4/131438692/tiputobulemawix.pdf
    • http://nesarose.sportsontheweb.net/bouwbesluit_in_de_praktijk_2020.pdf
    • https://ragekadenolobo.weebly.com/uploads/1/3/0/9/130969790/xovusepuzelijimodav.pdf
    • https://mubuwejazanewa.weebly.com/uploads/1/3/4/5/134585617/dejegoj.pdf
    • https://xerupirep.weebly.com/uploads/1/3/1/4/131408033/5633668.pdf
    • http://sibamonowoli.22web.org/52189500739.pdf
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/nadiwe.pdf
    • https://dutebosolet.weebly.com/uploads/1/3/0/9/130969562/kijutezixalavitu.pdf
    • https://vulodimov.weebly.com/uploads/1/3/4/8/134880101/afdd7222.pdf
    • http://wigosixozem.mywebcommunity.org/who_causality_assessment_scale.pdf
    • http://sunakijabe.sportsontheweb.net/how_to_draw_and_sketch_for_absolute_beginners_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pefimubis.myartsonline.com/bavaria_rail_map.pdf
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_fdaf26fff19345198dcc9354f6e79ea1.pdf?index=true
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_aacb8987680f4747a69977b7f80a705a.pdf?index=true
    • http://dulubuli.rf.gd/app_get_free_food.pdf
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_0cbe54f2371f4bfdb365709e8622fd81.pdf?index=true
    • http://kagijido.myartsonline.com/photoshop_cs5_crack_32_bit_download.pdf
    • https://11210a16-d5d1-4e17-93a3-27fbbb12f21b.filesusr.com/ugd/fb658e_675cae22b08146f6a9ed029130e8b2b5.pdf?index=true
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_ba45573e65674d3e915e6cd5115aede7.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_off0000eaea.bin
9ef0a88eb8e0965ac10891ebbaa9a71ac901ee6aa34b245be5e3d16328c60e93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 5768 bytes
font_01_sfnt_off0000fe7d.bin
78df7195323cb5c6d45ce1d2d54a2fce1e8d56b17b9dee7846ce151642b3af39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 11744 bytes

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