Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11ce22e812078f8…

MALICIOUS

PDF

70.8 KB Created: 2021-03-31 20:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8debc40f3643c23cf9e1b7cf6d5dcab6 SHA-1: 3a7718500c1803454489c9ce8ba1ba2714719beb SHA-256: b11ce22e812078f8c3b3afbdf61b92af9bbede00a959f2edc33c31f479a68285
186 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 0.9991

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/strik?utm_term=integral+of+x+sinx+cosx+dx PDF link annotation
    • https://rajezedej.weebly.com/uploads/1/3/2/6/132682549/jalemamedutaxobi.pdfIn PDF document text
    • https://kojezuduw.weebly.com/uploads/1/3/5/3/135326104/kejirilozavema_bupekare_sulexu.pdfIn PDF document text
    • https://dewosuto.weebly.com/uploads/1/3/1/4/131453399/gubon.pdfIn PDF document text
    • https://roguraluvi.weebly.com/uploads/1/3/0/7/130776180/dajidozakakesel.pdfIn PDF document text
    • https://wusitezuredov.weebly.com/uploads/1/3/5/3/135314125/xoxunigu-nediwa-wedudasuwi.pdfIn PDF document text
    • https://dasateju.weebly.com/uploads/1/3/4/5/134582383/6be0e4d9130ad5.pdfIn PDF document text
    • http://xozonline.ru/cryptic_crossword_solver_danj0is2.pdfIn PDF document text
    • https://puziwifatewir.weebly.com/uploads/1/3/4/7/134715637/dabd9d455.pdfIn PDF document text
    • https://nedebubet.weebly.com/uploads/1/3/4/8/134854500/5542247.pdfIn PDF document text
    • https://wumezovavupod.weebly.com/uploads/1/3/4/7/134741594/9958155.pdfIn PDF document text
    • https://bewizujire.weebly.com/uploads/1/3/2/3/132303264/6e258ad95.pdfIn PDF document text
    • https://wibujiwegawej.weebly.com/uploads/1/3/4/8/134899761/fcb0c610.pdfIn PDF document text
    • https://tujiwukof.weebly.com/uploads/1/3/4/5/134592642/67a881c.pdfIn PDF document text
    • http://car-den.ru/frayer_modeltsqex.pdfIn PDF document text
    • https://buvekidi.weebly.com/uploads/1/3/0/7/130775196/8378624.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_0ccf212f077f4ef69d0f0f3b90eb9557.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/phonics_worksheets_grade_2.pdfIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_ef9325055d9543cdb9c9ab42ed8cc414.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_b2a44428bbb549b1bccb41d2fc25fcfd.pdf?index=trueIn PDF document text
    • https://4b3c1411-62fe-4b74-ac0d-dad8ff5dd90a.filesusr.com/ugd/d10829_b494f58eda0642c6a74bce9477e9b737.pdf?index=trueIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_a120641a694643d99cf627aad58c819c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wofaxil/aves_sin_nido.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/zigodafakurodofo.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/epson_workforce_wf-2540_color_inkjet_all-in-one_printer.pdfIn 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_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 5192 bytes
SHA-256: c31b23d700c7eaf5523c85f075935526c1ac70088251de69f6512ce9713b032f
font_01_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 11032 bytes
SHA-256: 610f538585b0ead96f3ee801e3f524040c0563b9ac481acd2f37a1e2b74bb9c7