Malicious PDF — malware analysis report

Static analysis result for SHA-256 df58cb050a41719c…

MALICIOUS

PDF

36.7 KB Created: 2020-10-10 13:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3fc4c615e5484014bc1fb8a6400c60e9 SHA-1: f2732f36eac2de8d751c48f896619e8ed34459ed SHA-256: df58cb050a41719c08bbc72611faa36747b871e3a99697839749fed572a70bfd
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically identifies a link to a known malicious redirector, suggesting a phishing or malware distribution attempt. The document body text, though heavily obfuscated, contains references to 'sav file editor' and URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=sav+file+editor In PDF document text
    • http://files.stephengirardsgirardcollege.com/uploads/1/3/1/3/131384136/pipuz-lutizerenoxe-rebofobij.pdfIn PDF document text
    • http://dogil.designfea.com/uploads/1/3/1/4/131437233/1581550.pdfIn PDF document text
    • http://files.sampriti.us/uploads/1/3/1/3/131379639/dapumolivuvox-purew-niwurudisuz-rowipijawew.pdfIn PDF document text
    • http://files.rachelskaufman.com/uploads/1/3/1/6/131637224/dalutej.pdfIn PDF document text
    • http://files.bsmart.be/uploads/1/3/2/7/132712358/5603294.pdfIn PDF document text
    • http://sizag.wbcenters.org/uploads/1/3/0/7/130738525/notoravate-powujo-janebulikusewe-suzidum.pdfIn PDF document text
    • https://site-1042985.mozfiles.com/files/1042985/vulugule.pdfIn PDF document text
    • https://site-1037274.mozfiles.com/files/1037274/14689020373.pdfIn PDF document text
    • https://site-1036840.mozfiles.com/files/1036840/litubilalologep.pdfIn PDF document text
    • https://site-1037180.mozfiles.com/files/1037180/lelapivi.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/a8e1679a-e6f8-44f8-8c6d-4fd308ccf0db/3010357929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119c7340-ecd6-4efe-9fc0-85d2effc6bfc/60439187203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f314380-6efe-44d5-9161-2279f5d62856/basoxuvixeluredip.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_off0000527a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x527A 4888 bytes
SHA-256: 76b745d25a80c80cd5438c6cae9a606ad56cbf028b600ec35e4f2dee9a8a8bc8
font_01_sfnt_off0000632d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x632D 10396 bytes
SHA-256: c5d030906e05fba8b008aa57d7df48b7ba446aa3073294bd31ba5f463dd2abbb

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