Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4d2b011f1e5dd2…

MALICIOUS

PDF

86.2 KB Created: 2021-03-20 15:37:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cf5b0de771ced5b09974a8b4f3d1633 SHA-1: 58da04d98accf93bc5f9eec4552da1916cd9cb70 SHA-256: bb4d2b011f1e5dd25834cbed814bb2749018c8bce4a4040beeae0ee972a42788
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one pointing to 'xezojetit.ru', suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be related to medical procedures, potentially used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/aws?utm_term=how+to+stop+weight+loss+after+gastric+sleeve+surgery
    • https://dotawipe.weebly.com/uploads/1/3/5/3/135323210/nawulifif.pdf
    • https://cdn.sqhk.co/gotulurowav/GRibTfn/joplin_high_school_bell_schedule.pdf
    • https://lupirolawa.weebly.com/uploads/1/3/1/4/131453436/kevojolezorixa-febavowivin.pdf
    • https://jedurabononip.weebly.com/uploads/1/3/1/4/131453193/bfd61e265.pdf
    • https://peninugeba.weebly.com/uploads/1/3/4/6/134666339/edcbe0fc9e.pdf
    • https://pipabujul.weebly.com/uploads/1/3/2/6/132680817/2ab788cab4ba559.pdf
    • https://cdn.sqhk.co/wobuwozavenu/hhia0UY/30756523566.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_3ac1584cacaf46fe8aedcdd77f6145ba.pdf?index=true
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_cc5ae4008689494e962e88381bdc16b6.pdf?index=true
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_3663ce8620794c70a7c133fe43e9d26d.pdf?index=true
    • https://s3.amazonaws.com/gavobawum/fluke_t5-1000_electrical_tester_small.pdf
    • https://uploads.strikinglycdn.com/files/7723e3a6-f9f6-4d35-acc5-f4820a96fb81/totofatetub.pdf
    • https://uploads.strikinglycdn.com/files/f8a3bbb9-a021-4482-857f-4bdf2ad55459/48863666805.pdf
    • https://s3.amazonaws.com/vexeliku/hollywood_mix_tv_guide.pdf
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_9b81865d7e3845c8a516b3529e2865aa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/036bc62e-2c11-49dc-b031-69432517c503/basazazivagufubefixa.pdf
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_ded30f5397894b3c991271dbbce19d02.pdf?index=true
    • https://s3.amazonaws.com/samopakamefap/57421529625.pdf
    • https://s3.amazonaws.com/bogeguva/wepugotarukivup.pdf
    • https://uploads.strikinglycdn.com/files/5bccb370-f8a0-4899-8157-dbb3d53da8b8/the_dhandho_investor_price.pdf
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_cebce18bd8594eba87220c0ee57eb3a0.pdf?index=true
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_11f4eec72cfb48a5b84edd7f44423bc0.pdf?index=true
    • https://s3.amazonaws.com/lorifumofelu/daputijakovorenize.pdf
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_678ab702bdf84a0e8e21a175334343ad.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_off00011267.bin
ea5146f154eb3846c267f9e2551fa1a504f6076efc5e29b9397751f7b6e7f0fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 5492 bytes
font_01_sfnt_off00012538.bin
7cc258906aad1e6473594d77e52d6a4a6ef21631ec593acada3d914178dc8862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 10836 bytes

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