Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16bc3b7ec6cf925…

MALICIOUS

PDF

81.3 KB Created: 2021-03-31 10:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b2a6704e41beed0ca5a58622e5ff5d84 SHA-1: 2b083472eb33bfecfebc24b07318e0fd141524f3 SHA-256: e16bc3b7ec6cf925c7508a094cca03e14c4ce27fda5c04913e619887181ed22b
134 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a 'download button' lure further support this assessment. While no scripts were directly extracted, the overall structure and URL distribution point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=french+and+indian+war+webquest+answers PDF link annotation
    • https://rizipopene.weebly.com/uploads/1/3/5/3/135316145/wofabalijajin.pdfIn PDF document text
    • https://muwalarole.weebly.com/uploads/1/3/5/9/135959937/goniwapaxo.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/ielts_reading_practice.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/xutolavuselunefojodo.pdfIn PDF document text
    • https://zopogunonezaso.weebly.com/uploads/1/3/1/6/131637395/4b54c80dc.pdfIn PDF document text
    • http://duwosolutanuz.mypressonline.com/pexinajapumosepazebujiwu.pdfIn PDF document text
    • https://sidamegudikeza.weebly.com/uploads/1/3/4/5/134585927/rugakebawo.pdfIn PDF document text
    • https://wagelefukat.weebly.com/uploads/1/3/4/2/134265927/wimirijixugoxop.pdfIn PDF document text
    • https://wapubepedud.weebly.com/uploads/1/3/1/4/131455956/7ccfb67c51b.pdfIn PDF document text
    • http://prizinsta.site/topology_maths_bookslcvv.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/cjapvhd/99862621386.pdfIn PDF document text
    • http://bigops.fun/tarokuxapak8rx0o.pdfIn PDF document text
    • http://alsamcctv.com/mogobeafny5.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/3_letter_airport_codes_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/widigwV/xiaomi_yi_mini_dash_camera.pdfIn PDF document text
    • http://starconflict-game.ru/51969522873bw3d2.pdfIn PDF document text
    • https://falojabuvo.weebly.com/uploads/1/3/4/7/134774067/d2833851.pdfIn PDF document text
    • https://kowuzuworos.weebly.com/uploads/1/3/2/6/132682574/c518ab62bb.pdfIn PDF document text
    • http://numulul.mygamesonline.org/pudabesumomemovixuworawi.pdfIn PDF document text
    • https://vizijupazikek.weebly.com/uploads/1/3/2/8/132814338/nazatixufirapu_musizurupetoli.pdfIn PDF document text
    • http://meroxisawifagu.mygamesonline.org/84949659708.pdfIn PDF document text
    • http://zutumufedige.getenjoyment.net/destination_b2.pdfIn PDF document text
    • http://momsmall.space/reading_comprehension_practice_onlineog6hq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xemigososefof.atwebpages.com/julewemipu.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/how_to_connect_atem_mini_to_atem_software_control.pdfIn PDF document text
    • http://dipuleragix.onlinewebshop.net/modadoba.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_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 5308 bytes
SHA-256: e1d114849e244aaa5ac620d7f09708051b3fe6b42dfd75003908f3093bf1cf10
font_01_sfnt_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 14264 bytes
SHA-256: 23db0e2ebe56c9fa0c8b592506f97477e248dbc70f00c7464ccb7d2113641b9d