Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b5c32e384c2f8d…

MALICIOUS

PDF

46.3 KB Created: 2020-10-06 11:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1e1c60b94767af8f5b7443c447e99a45 SHA-1: fe4205834b6931c4e9dc9bfe1cdc3067e1ebc699 SHA-256: c3b5c32e384c2f8d5c9170b41acf37736532ec677e4654a0cd7473aefe4f90fa
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and heuristics suggest the PDF is designed to redirect users to malicious sites, potentially for phishing or malware distribution.

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=dossier+professionnel+exemple+rempli+gratuit In PDF document text
    • http://files.divinesoulenergy.com/uploads/1/3/0/9/130969819/d55ccdadbe3c.pdfIn PDF document text
    • http://mixikuxis.neworleansmidwives.com/uploads/1/3/1/4/131483214/d0781.pdfIn PDF document text
    • http://deful.halcyontv.com/uploads/1/3/1/3/131383434/5165215.pdfIn PDF document text
    • http://gusik.stitchwise.com/uploads/1/3/1/0/131070792/4336184.pdfIn PDF document text
    • http://files.peaceag.org/uploads/1/3/1/6/131606309/zulinupusevigut_rixopi_levazes_torariwip.pdfIn PDF document text
    • http://files.sunilgupta.net/uploads/1/3/0/8/130814763/a0c1d0.pdfIn PDF document text
    • http://lized.parkjungyoon.vip/uploads/1/3/0/9/130969130/7734617.pdfIn PDF document text
    • http://files.worxforms.com/uploads/1/3/0/8/130813860/basuzafowelo-lopikana-zujodubapivuj-xojaxopirotuxaz.pdfIn PDF document text
    • http://files.marybuchinger.com/uploads/1/3/1/0/131070849/3047207d9d4f41.pdfIn PDF document text
    • http://juzewaso.letsdialogue.org/uploads/1/3/2/7/132710589/xiluxejafine.pdfIn PDF document text
    • http://files.ph-biotech.com/uploads/1/3/0/7/130740547/bujelafepez.pdfIn PDF document text
    • http://files.bigbuckssupply.com/uploads/1/3/0/7/130739593/1854256.pdfIn PDF document text
    • http://files.atlantaicedanceweekend.com/uploads/1/3/1/0/131069921/pumemajit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000728f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x728F 5288 bytes
SHA-256: 62a8a3313899d74aa0f62a9b4ca65a16147aff45e99dffb9cdce37d55fffd4c1
font_01_sfnt_off00008480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8480 11904 bytes
SHA-256: 26871d43c60b590c192a86eb97847621f5a41dfd84e93ff7975f914bb4237e2c

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