Malicious PDF — malware analysis report

Static analysis result for SHA-256 17be0ad0350e15ea…

MALICIOUS

PDF

66.6 KB Created: 2021-03-05 10:54:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 89bc9cabef7d295686a4ebf2f7bde30f SHA-1: b4529582df8a6447d8b64bdf43f0991192e89025 SHA-256: 17be0ad0350e15ea2bbc38c6fae34bd2edf4e3b6ba33cc7cf5fb4d18d6631cad
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary lure being 'sentence structures worksheets pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and extensive URL list suggest it's designed to redirect users to potentially malicious content hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=sentence+structures+worksheets+pdf PDF link annotation
    • http://esclub.pro/xigavajoxuserajoxumf0nja.pdfIn PDF document text
    • http://8gusevshop.website/41847263683a7n3g.pdfIn PDF document text
    • https://bevoparekev.weebly.com/uploads/1/3/4/0/134018333/mazaputa.pdfIn PDF document text
    • http://eferevole.com/68026168840a155u.pdfIn PDF document text
    • http://good-production16.site/will_there_be_a_4th_movie_to_the_divergent_seriesxyod7.pdfIn PDF document text
    • https://salupoxegiras.weebly.com/uploads/1/3/5/9/135961269/ba17f1f2dcd4.pdfIn PDF document text
    • https://voxipomawo.weebly.com/uploads/1/3/1/3/131379395/dce5221.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/e6688cfeb.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/31303677227ibmd2.pdfIn PDF document text
    • http://drenajkrasnodar.ru/katurefagesivemuniju3n8ka.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/tilidi.pdfIn PDF document text
    • https://majurunonixo.weebly.com/uploads/1/3/1/0/131070356/4099998.pdfIn PDF document text
    • https://wemizufatevovig.weebly.com/uploads/1/3/4/8/134896488/zaxugowewesixi.pdfIn PDF document text
    • http://avto-trokot.xyz/ryobi_pressure_washer_manual_2300zgb62.pdfIn PDF document text
    • https://xaxazusilu.weebly.com/uploads/1/3/4/7/134757455/jowojevix.pdfIn PDF document text
    • http://esclick.pro/481739284g0c5t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b9efa4f-214d-4689-902f-f54889eb1fe6/fulap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1515b2a-ecbc-4e49-9ffa-9c814729ec0f/73262790726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab66d93f-31a7-4997-9bdc-de3668884b58/pojanusumeruki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04239614-8c14-4eef-b8e1-2cc95a07640d/doririxuvazuwapi.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_off0000c83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83C 5260 bytes
SHA-256: 6707041a819c49a92864d0390f962d9d4a4ab14863edbe3ea51e707d9caa07b2
font_01_sfnt_off0000da3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3A 10160 bytes
SHA-256: b797b7ed0f7a866e85c66a8023032f493edbe588dc6eb6880131cb253af50905

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