Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae713465d0184c36…

MALICIOUS

PDF

92.3 KB Created: 2021-05-29 19:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 865cdc08c3c964730022b189a0a19ce3 SHA-1: ea2dedc2c7db61e1d6aed5e1cb700d911c378673 SHA-256: ae713465d0184c36dcd5c4007d98937599f256aba186f69b684992164675e399
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection scheme. The primary URL, 'https://vilenefex.ru/strik?utm_term=cuanto+es+120+gr+de+mantequilla+en+cucharadas', appears to be a lure to a malicious site. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=cuanto+es+120+gr+de+mantequilla+en+cucharadas
    • https://noxojinuk.weebly.com/uploads/1/3/4/4/134479051/lixukapor.pdf
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/ladakupani_rebepi.pdf
    • https://cdn-cms.f-static.net/uploads/4415291/normal_606a5e2a17bc9.pdf
    • https://cdn-cms.f-static.net/uploads/4471230/normal_606279bb06f88.pdf
    • https://lababober.weebly.com/uploads/1/3/5/3/135329518/706210316918dd.pdf
    • https://semowonobepak.weebly.com/uploads/1/3/4/2/134235862/5266842.pdf
    • https://wowemaba.weebly.com/uploads/1/3/1/3/131380083/0088ba6922f13.pdf
    • https://cdn-cms.f-static.net/uploads/4460944/normal_601282abe8c6c.pdf
    • https://werafapotavide.weebly.com/uploads/1/3/0/9/130969473/lerid-wifojuni-sojugi-zozanuvutulu.pdf
    • https://nifavoweju.weebly.com/uploads/1/3/0/7/130739528/2409973.pdf
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/18043e0bcce.pdf
    • https://bajepexalotatif.weebly.com/uploads/1/3/4/8/134851886/ruvigobopigijesole.pdf
    • https://gofutetawavoror.weebly.com/uploads/1/3/0/8/130874623/zizezolevufar_xedopawoziwim_luwomufo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2a563b57-d494-4c9a-9f5e-574f7be7c3c5/83746129367.pdf
    • https://uploads.strikinglycdn.com/files/d1a2d107-a438-4750-b501-106b6d913523/1967_ford_mustang_shelby_gt500_for_sale_in_south_africa.pdf
    • https://uploads.strikinglycdn.com/files/9f904136-4c5e-41b1-9735-4476818ca33f/what_is_a_wishful_thinker.pdf
    • https://uploads.strikinglycdn.com/files/4654dab6-7403-4aae-afd8-a76cde4492dd/94889280175.pdf
    • https://uploads.strikinglycdn.com/files/98b8af72-f458-4e71-95ba-9c88ac7d33c1/drawing_book_amazon.pdf
    • https://uploads.strikinglycdn.com/files/0a74d2f5-f342-4cfd-be13-9c70f12db877/bancomer_san_jose_iturbide.pdf
    • https://uploads.strikinglycdn.com/files/8630dd46-0696-4be5-86f9-4003e9385868/fujitsu_mini_split_error_code_11.pdf
    • https://uploads.strikinglycdn.com/files/9d322330-4bb7-4002-9f5a-48e4c4b42270/the_next_power_book_2_episode.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f966.bin
5dbc4c63e1ac5d9cb99ca65b247d0abcbabb6b89127514d822fc65eee2030c69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 5712 bytes
font_01_sfnt_off00010ca2.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 1800 bytes
font_02_sfnt_off00011530.bin
a0070d1717288048decf7fbae938910207d96ba4f7ad168a1a930519d03d79c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 13152 bytes
font_03_sfnt_off00013ea1.bin
f3b95f1269985bafc3dfb9b5b35e76df8a4d57039a143c013aed99c7cf3a4a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA1 16344 bytes
font_04_sfnt_off0001541a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1541A 4324 bytes

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