Malicious PDF — malware analysis report

Static analysis result for SHA-256 983865fc53c947a3…

MALICIOUS

PDF

79.1 KB Created: 2021-02-21 21:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 887b6ac7d893ce5c3e498077ab0857ba SHA-1: 90da28bb44063189950954fb602ab185da3e4f55 SHA-256: 983865fc53c947a3ea0104e608fb70e0df1087acd667a1495e76c3deff0d7244
134 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous external links to various websites, many of which are hosted on disposable domains. The document's content, though partially obfuscated, suggests a lure related to 'free online bible quizzes and answers' to entice users to click on these links. The ML classifier strongly indicated maliciousness, and the presence of a link farm on disposable hosting further supports a malicious intent, likely to distribute malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=free+online+bible+quizzes+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451742/normal_6022e60e3dec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_60217e203fba4.pdfIn PDF document text
    • https://bojuwidus.weebly.com/uploads/1/3/4/6/134698781/4264928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_601b8d5def18c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394068/normal_60240580a02eb.pdfIn PDF document text
    • https://sajinekud.weebly.com/uploads/1/3/5/3/135391411/nebikebev.pdfIn PDF document text
    • https://jepukarebav.weebly.com/uploads/1/3/5/3/135321711/rigene-fuvimo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421056/normal_5fdd3a4d1c54f.pdfIn PDF document text
    • https://nusimilanagazi.weebly.com/uploads/1/3/1/4/131454102/lemisipujeramud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472198/normal_602ec8beee754.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369525/normal_5fc9273e33bc3.pdfIn PDF document text
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/bomikivezevax_ziveguvuxodux_dusivado_bexoluzozutite.pdfIn PDF document text
    • http://xivitej.66ghz.com/love_couple_status_hd_wallpaper_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484806/normal_5fdd61240aecf.pdfIn PDF document text
    • https://rilewinip.weebly.com/uploads/1/3/5/9/135964764/9b29caf2601665.pdfIn PDF document text
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/9919765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491686/normal_602f69c3cb09a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejinubonuxus.epizy.com/arduino_mega_1280_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/52777998446.pdfIn PDF document text
    • http://vozefure.rf.gd/samsung_secure_folder_mod_apk.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_off0000f93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 5180 bytes
SHA-256: b005a1b4a1344b02d33dd75b3a5706348ca43b991f7e62010a17684018bfe780
font_01_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 10460 bytes
SHA-256: d95a184de278b9c896f7ce03535382c566ca44bce922c2da17a006d786bf7c32