Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0795f14ab345056…

MALICIOUS

PDF

71.0 KB Created: 2021-05-16 16:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb66cbfa2b3d6a00ac2853e19b2fe1d8 SHA-1: a7185a5dd1ab4cbe699a85ce404b48c6f68ec47b SHA-256: e0795f14ab34505668d0642d408319f099864cdf09a8aa9af8df55e6ce640375
156 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 are to other PDF files, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://jumiwimov.ru/strik?utm_term=scert+maths+textbook+for+class+10', is presented as a textbook, indicating a likely phishing or scam lure. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent, as confirmed by ClamAV and ML classifiers.

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-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://jumiwimov.ru/strik?utm_term=scert+maths+textbook+for+class+10
    • https://static.s123-cdn-static.com/uploads/4420934/normal_5fec5d53cddc0.pdf
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5ff4196e145bb.pdf
    • https://cdn.sqhk.co/bupabumo/cRrk7b0/jolamonigiragik.pdf
    • https://votujejigep.weebly.com/uploads/1/3/1/3/131380583/kuriditununaf-xevegu.pdf
    • https://dojebuxepoviguf.weebly.com/uploads/1/3/1/4/131407435/lujuzaniwodilevo.pdf
    • https://kefomituwo.weebly.com/uploads/1/3/2/8/132815939/2570098.pdf
    • https://cdn.sqhk.co/tifapoxur/blifjaV/background_erase_gif.pdf
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/8551122.pdf
    • https://cdn.sqhk.co/dofexoxev/Ujjigyj/benikavodu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_e27f2be852b444388cf38d6546fc7043.pdf?index=true
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_1cb891fbb5ce44cca09f7008fedd197e.pdf?index=true
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_5930a82eb43544ebb50bd32ddcbbe982.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8ffdb3a3-dad0-44b9-a5cb-f6ccd570d378/detajasibetofivuxevufakik.pdf
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_925b269191d4437483383668c303038e.pdf?index=true
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_c027ee5457a84bdca7540b0c2339a27d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9e4561a8-a172-4e3f-9898-99c557dab8f3/how_to_clean_a_keurig_without_a_water_reservoir.pdf
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_49c4c7079d144233830b09ff32471f49.pdf?index=true
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_2e9ba6ecc47541fd9cbaef3e53c3dd09.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a8bec74d-1842-42cc-b019-88f70183be4f/animorphs_the_invasion_summary.pdf
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_6ce6b397fd3e44a48cec19bddbbe6e6b.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_off0000d40c.bin
bab1b764b02f57983ba2128184398719f445eea752bde184494234bbb7736744		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD40C 5688 bytes
font_01_sfnt_off0000e746.bin
c10cee69c30d653a5b0e4b96537d68a5ebec6aa71de96706964128fa78a63f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 11072 bytes

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