Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b47eda05d4e6e1…

MALICIOUS

PDF

88.4 KB Created: 2021-05-29 04:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26d4c4edf14247cbd80e7d48613b1fc4 SHA-1: 2d39f5147cbcd811a0af9096226627c363196fb3 SHA-256: 90b47eda05d4e6e18717bb928063fea30ddde7e9f2488d01f9b4aaafe1a05a2b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO abuse tactic. One of the embedded URLs, https://nipisod.ru/strik?utm_term=circle+review+worksheet+7th+grade, is a primary indicator of potential phishing or malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=circle+review+worksheet+7th+grade
    • https://static.s123-cdn-static.com/uploads/4420260/normal_6005605788445.pdf
    • https://kezagoguz.weebly.com/uploads/1/3/4/1/134131769/sifudomonojasuj-kekolezom.pdf
    • https://cdn-cms.f-static.net/uploads/4444850/normal_604e716fe0ce4.pdf
    • https://mogalarozo.weebly.com/uploads/1/3/5/9/135968713/88b5bfe5d51fd.pdf
    • https://sedibifaboneduv.weebly.com/uploads/1/3/7/5/137500790/zofutaze.pdf
    • https://nokifijipuf.weebly.com/uploads/1/3/4/3/134305843/pakuzip.pdf
    • https://cdn-cms.f-static.net/uploads/4449974/normal_5fd8790c328d7.pdf
    • https://cdn-cms.f-static.net/uploads/4412391/normal_605d57c2d0a83.pdf
    • https://static.s123-cdn-static.com/uploads/4487409/normal_5fdd9a1b1e70c.pdf
    • https://menelaxewo.weebly.com/uploads/1/3/4/3/134362368/fogaduxagax_karamipenanete_zofiv.pdf
    • https://menebunokusup.weebly.com/uploads/1/3/4/5/134588819/3353752.pdf
    • https://cdn-cms.f-static.net/uploads/4451044/normal_606c60c6de4ff.pdf
    • https://static.s123-cdn-static.com/uploads/4393183/normal_5ff82f8f5c4da.pdf
    • https://static.s123-cdn-static.com/uploads/4484631/normal_5ff88cdcc020a.pdf
    • https://pagowabelada.weebly.com/uploads/1/3/0/8/130874520/5813950.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/39746ca6-2198-4d15-b15e-2f1a916e6aed/22763520896.pdf
    • https://uploads.strikinglycdn.com/files/eefec7a7-094f-430e-86c0-54cd55a0652a/23457786748.pdf
    • https://uploads.strikinglycdn.com/files/8dd16d99-7158-4894-8569-1415a14c1989/saripisulifimifejer.pdf
    • https://uploads.strikinglycdn.com/files/a7654710-c45e-478f-97da-332366e603ad/the_legend_of_zelda_ocarina_of_time_master_quest_differences.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_off0000e7d2.bin
917cc78fa06f0f995c205b7a9bea0decef985891c54fafddaa3d81c207db4c08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 5400 bytes
font_01_sfnt_off0000fa3d.bin
70974072a5c656cb8901bea78133902ef1197d00f8a1afeef7c12c436c608c1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 3068 bytes
font_02_sfnt_off000106ef.bin
d86100ab755b5c041e9c527dabea54faeef0c9072aee3d4cbf22eef43e2f102a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 10596 bytes
font_03_sfnt_off00012ba8.bin
cd182d2e9ea864fab9520f1b843dd829a2b37d3f55d42b6e9f6a77e8553d0714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 16584 bytes
font_04_sfnt_off000142a5.bin
05f7b4842fc7b69e9d69f3eded39cb033fbe631bfb3b5dcea0386597fa33b4e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142A5 4324 bytes

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