Malicious PDF — malware analysis report

Static analysis result for SHA-256 688543e3370e5b8f…

MALICIOUS

PDF

86.6 KB Created: 2021-03-10 11:42:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8e7628c464c3db142d3c3896ecd3435e SHA-1: 4053eb2fca6a3bab5d77362c4863ff15406c100e SHA-256: 688543e3370e5b8f17f74c6b458a90933461abb62877fd36ac6a4a33d204d1b6
134 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document attempts to impersonate a legitimate communication, likely to trick the user into clicking the embedded URLs. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest an attempt to download and execute a second-stage payload.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jumiwimov.ru/award?keyword=bakery+products+pdf PDF link annotation
    • https://kawuzuvom.weebly.com/uploads/1/3/1/3/131379118/8880806.pdfIn PDF document text
    • http://ifeelgood.club/love_and_respect_book_problemsns4sr.pdfIn PDF document text
    • https://xitolomeka.weebly.com/uploads/1/3/4/0/134012462/perimutejomutimak.pdfIn PDF document text
    • https://jurazevogepepa.weebly.com/uploads/1/3/0/9/130969245/tonejada_businixedajub_kazinexososaki_jumuvodijo.pdfIn PDF document text
    • https://denuxikunoleluj.weebly.com/uploads/1/3/4/0/134018299/208836ac99.pdfIn PDF document text
    • http://sibuvre.com/capitalization_exercises_with_answert7tv4.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/bozorinugeveped.pdfIn PDF document text
    • https://toxofeleziwogiz.weebly.com/uploads/1/3/1/4/131406173/degesuxave.pdfIn PDF document text
    • https://zenimuxen.weebly.com/uploads/1/3/4/3/134317926/vagolurem-razuderil-raboxamexit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/44355621355.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/zowebizinikejukosaxi.pdfIn PDF document text
    • http://xafasefulunasa.epizy.com/what_are_chemical_sedimentary_rocks_formed_from.pdfIn PDF document text
    • http://xitufadaxavak.epizy.com/anabolismo_autotrofo.pdfIn PDF document text
    • http://nezexufefel.epizy.com/terry_goodkind_wizards_first_rule_book_order.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/contract_of_purchase_and_sale_bc_form.pdfIn PDF document text
    • http://kuzibawo.rf.gd/netflix_app_android_9._0.pdfIn PDF document text
    • http://leronusofawu.epizy.com/how_to_use_a_rug_doctor_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/bezujeritola.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_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 5332 bytes
SHA-256: b285a70258edf3dc5ed5dfd3613411968d1efe6c40a71ffcdb042feeb8095b25
font_01_sfnt_off00012920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12920 10704 bytes
SHA-256: 4dd61d05bcd96e51854ceb065f1e7001f505479e5015a81dea0fa19504cb2450

Open this report in the interactive analyzer, or submit your own file for analysis.