Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1644cf81777f5c…

MALICIOUS

PDF

88.4 KB Created: 2021-03-09 02:24:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 258406b4e5e0b98ddb8315a2812dea29 SHA-1: de903f78e8e7bb5f7bdb3b3bdfffc1eb1a53566b SHA-256: 8d1644cf81777f5cd3f8ea935f75b2716a6bec774291987ce12960a446d5327b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many of which are to PDF files, suggesting a link farm or redirection scheme designed to obscure the ultimate malicious destination. The primary malicious URL identified is https://ponafet.ru/123.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=bleacher+report+world+football+power+rankings
    • https://cdn.sqhk.co/furafurume/hjSjjeb/51372224220.pdf
    • https://xetutimi.weebly.com/uploads/1/3/0/9/130968997/ca2ca290c1.pdf
    • http://digovin.getenjoyment.net/gurifulupolewafafalepoj.pdf
    • https://cdn.sqhk.co/javomekoru/igpgdvA/hotel_price_comparison_sites_trivago.pdf
    • http://nexofozupugasi.mywebcommunity.org/bikuxawilogikumawemibo.pdf
    • https://jakugogafezokev.weebly.com/uploads/1/3/1/4/131437362/c7d5bf02819447.pdf
    • https://boxenujanazikof.weebly.com/uploads/1/3/5/3/135302290/rupujosodisik.pdf
    • https://cdn.sqhk.co/noxuwitide/ijcjah1/fuvetupogulitejebiwajeg.pdf
    • https://rabupipimefife.weebly.com/uploads/1/3/0/8/130874594/tebofukafixupetawexa.pdf
    • https://cdn.sqhk.co/medipevagopu/ehcBbgi/jiwanurevaxadasis.pdf
    • https://cdn.sqhk.co/kurotevu/ifhgUie/22046105707.pdf
    • https://gepobuxew.weebly.com/uploads/1/3/1/0/131070920/pafujizuxuzu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c3e3112d-f452-41e8-b277-bd8257a3a251/aircraft_maintenance_technician_cv_sample.pdf
    • https://uploads.strikinglycdn.com/files/82f9008f-b363-4974-877b-dfb407baf51f/212_degrees_meaning.pdf
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_b99c85c7999e42e9b96e6ae62886e145.pdf?index=true
    • https://uploads.strikinglycdn.com/files/805a9f83-78fa-461d-af07-db2ce901ba4d/apc_back_ups_700_continuous_beep.pdf
    • https://uploads.strikinglycdn.com/files/cff31992-556d-4d6d-8082-6e6192b564dc/difficult_word_searches_for_adults.pdf
    • http://kisalonokexiwi.atwebpages.com/80886665813.pdf
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_b1ec8da6c8c64f31be58bb8d7ad57bd5.pdf?index=true
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_17677cf775d04eb3889c83bcc0aa10d8.pdf?index=true
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_ade2a9213f954961bd87b3f1356440d1.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_off000119f9.bin
0b52b6096e6a3ee50a9e7f21c47c36cc10e1cf7c3822b01cc75b3d6e29ddfa8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 5760 bytes
font_01_sfnt_off00012da2.bin
52284d35eb28ecf40b8572aa0a73a8fb92207bbd3422c485b99f258222bb3954		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA2 11356 bytes

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