Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde7f51f2a53684a…

MALICIOUS

PDF

76.4 KB Created: 2021-03-05 07:30:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a044896036b59499a8776d0d2367ea10 SHA-1: d754a10e97f6346a0f1db05b9649c38cf242beeb SHA-256: bde7f51f2a53684a7180fa8f43d4e3ac2dc9c9c042a71695a3f49909bad8e650
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on file-sharing services, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URL and the document body's deceptive title 'Wordly wise book 7 lesson 8 answer key' further support a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/strik?utm_term=wordly+wise+book+7+lesson+8+answer+key
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/7679349.pdf
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/9621484.pdf
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/piwojunig.pdf
    • https://boxusopusaw.weebly.com/uploads/1/3/1/3/131398197/f6ef2d.pdf
    • https://temetufel.weebly.com/uploads/1/3/1/8/131856903/pegukopere.pdf
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/518489.pdf
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/4903876.pdf
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/botuj.pdf
    • http://mpvideo.org/manedugonemijapafudegogodvy7gv.pdf
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/ddb8a.pdf
    • http://bosnoslovnoejelaniekupit.xyz/17673382573uxhw3.pdf
    • http://podipotekoi.ru/tulemunabofageprdgs6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/809fd005-2305-48ed-b76b-081c23b82594/texas_driving_test_parallel_parking_rules.pdf
    • https://uploads.strikinglycdn.com/files/b0b29c5a-8911-4f1f-bfb9-bc50f8ac1df3/arbol_genealogico_de_abraham_en_espaol.pdf
    • https://uploads.strikinglycdn.com/files/aab6d161-26c9-4dd3-ae4f-a523e3f135c3/best_android_programming_language_2020.pdf
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_28abf9a20f1d4023818154fed1c051cd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/13c76d5f-dee8-41f3-a59e-1d7dc23990b6/enoch_calendar_2020_lds.pdf
    • https://uploads.strikinglycdn.com/files/cc9b7f7a-5a90-4388-ac18-8a8a79168c2e/40329962223.pdf
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_5e5026e4f0714c79b7bfc188c2f0f7b4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/175b935f-f7f1-467f-bbe9-2d242aed1bd4/42667944502.pdf
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_285490df50c24d6cb4ff2ee28fc208c8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c5161fa8-f474-42b3-b132-7f1ad074ea53/ditupokunevajavoxokiwut.pdf
    • 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_off0000e6e4.bin
8db55ba205e77de03b50d8b72556b0263fdba22f588eeb7ffa53952fc63f836b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 5504 bytes
font_01_sfnt_off0000f9ce.bin
0c91827e9761fdc785911f2c04e7e1e56732d8469a38b873333b75e2e16b04eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 13248 bytes

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