Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f8b2c33d4a8d00…

MALICIOUS

PDF

80.2 KB Created: 2021-03-21 03:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 90fa9c3bc7e457df5fb5462fb98fe592 SHA-1: e96aea7814a8cbe188b018af1e419e5b3bb2a96e SHA-256: e8f8b2c33d4a8d002184a57f8345517dcb08c85e6981a9bb61d6acc1bd7ce2ba
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://lozipotod.ru/strik?utm_term=cuales+son+los+sintomas+del+covid+para+ni%25C3%25B1os PDF link annotation
    • http://rijewomel.scienceontheweb.net/kidatumov.pdfIn PDF document text
    • http://ketenimolupev.sportsontheweb.net/disavawufatonutaro.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/89017733269.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_b84a156f319c428a882d593140ced813.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_a2a7544ebbb54138ad50c389a0a0e580.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farowug/lirirasuv.pdfIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_43c1cebb3d5a4cf593e3c22358a88454.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/96751757867.pdfIn PDF document text
    • https://82c1a4a6-0aea-44ab-842b-07cb5bdde860.filesusr.com/ugd/aafee9_7fcb12ee4b54420c98a0a4dc075741ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/64888771710.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_166f5e3360ce4b82a8e052d07f355087.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_c238d3da06dc45a3b4f80b33e77aedc1.pdf?index=trueIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_3851be128f2f4f1eb4b00bfbda2e87f0.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_9c268d6771614d08bc190097c4b26a68.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_669f8f02c4504b38ae4445a741c048a7.pdf?index=trueIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_2856bc3866ae4ae7831bfbf94c8105ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guxosa/owen_meany_book_review.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_66dad50111fd4911822c2c7d94dfe626.pdf?index=trueIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/nimiwesadolukasukupuzuf.pdfIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_242f75a690994f3b920bffc94de41673.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejobu/undergraduate_student_cv_template_doc.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_759e57f091394888868059d58af7bb94.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_8e9c681fc30f428f90a3c038301b1f45.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 5396 bytes
SHA-256: 8327fc6c1c68eea74c70af32c2283acd1537d8ac496dbd2631e3ff83d20295c7
font_01_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 12036 bytes
SHA-256: 731d4cde615480ed748cd16d6165cf6fc82ba2c207871a3ee7f61c4e8dddd9c8

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