Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a17b3a5426a9f7…

MALICIOUS

PDF

77.4 KB Created: 2021-03-21 08:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b1f31e7be248b997d8d644dca06893c SHA-1: 7b6cdabb3698e8c6e4394b6022f528efe83bd2c6 SHA-256: e1a17b3a5426a9f773f6349c7e3a4b39538e8605b978042748f76bd5d867af84
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One prominent URL, 'https://seumenha.ru/award?keyword=encyclopedia+of+an+ordinary+life+pdf', suggests a lure related to document access. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

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://seumenha.ru/award?keyword=encyclopedia+of+an+ordinary+life+pdf
    • https://static.s123-cdn-static.com/uploads/4473031/normal_5feeeeb6274f9.pdf
    • https://cdn-cms.f-static.net/uploads/4465924/normal_603541a02ec9f.pdf
    • https://cdn-cms.f-static.net/uploads/4420029/normal_6039a9ae4fd44.pdf
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5fe7952076405.pdf
    • https://cdn-cms.f-static.net/uploads/4401971/normal_603e1ae63c5f0.pdf
    • https://cdn-cms.f-static.net/uploads/4487007/normal_5fd61d5936a07.pdf
    • https://static.s123-cdn-static.com/uploads/4452863/normal_5fe30bf688449.pdf
    • https://cdn-cms.f-static.net/uploads/4390323/normal_6035953a564a7.pdf
    • https://static.s123-cdn-static.com/uploads/4424043/normal_5fce35b8a697c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_c693e43bd4444f15b40523c73b752a7e.pdf?index=true
    • https://s3.amazonaws.com/satedafadusizo/pifudirujekeditejuxi.pdf
    • https://uploads.strikinglycdn.com/files/6d9d1731-8f59-4763-ae6b-569ee2f79a1b/data_structures_used_in_computer_science.pdf
    • https://s3.amazonaws.com/tinajabizoreguf/analytical_geometry_grade_12_questions_and_answers.pdf
    • https://s3.amazonaws.com/fokapikow/63736221398.pdf
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_df76d58082014477ae7cc7c697472986.pdf?index=true
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_17e62cfc04cd425d9e5faae35b95367b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7e4a8c20-f5ee-4a56-91e6-f19270cb6f4e/sadet.pdf
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_ac3f2a6d168344528b966cbfd4df78b6.pdf?index=true
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_00279158a8b24db891d32f96d6de3b85.pdf?index=true
    • https://s3.amazonaws.com/tikoweravisixu/ar_rahman_hits_in_kuttyweb.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b8.bin
330f9d643636333f35bce4acf0ea22daf1994782bbc2f420c37dabf6fee4889a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 5032 bytes
font_01_sfnt_off000101f5.bin
3884eec4ea2ccc05b4e555f0b61f98c10078ef7bf75287f1927f4b7a224453a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 11252 bytes

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