Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a154a283bb3525…

MALICIOUS

PDF

70.3 KB Created: 2020-12-25 02:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 384ccce19bafee57a6174fb4a96ebfaf SHA-1: 1256a34a3056566a64f913f3efca003a721b26bf SHA-256: 82a154a283bb352551dec26142f03f5d78ff2ea4ffc2e83ce18f7116782d87a6
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=brilliant+synonyms+in+english
    • https://cdn.sqhk.co/kupemopo/L5hghBM/cheap_weekend_flights_to_amsterdam.pdf
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5f933eadcd508.pdf
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f8bab1a2a0c3.pdf
    • https://cdn-cms.f-static.net/uploads/4453103/normal_5faa2d8501b2b.pdf
    • https://bibomezu.weebly.com/uploads/1/3/2/7/132710601/4f3beebcc.pdf
    • https://kuruxodevudule.weebly.com/uploads/1/3/4/7/134728431/kapizogarigejabakifi.pdf
    • https://cdn.sqhk.co/balekunu/idsrwib/62191493181.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/86a369ed-ad78-4362-8bee-e8bbab258f5d/21351016286.pdf
    • https://uploads.strikinglycdn.com/files/f4e630f2-1b34-44f1-a195-4895046a8858/18906992902.pdf
    • https://s3.amazonaws.com/pafiganovavi/27321664615.pdf
    • https://s3.amazonaws.com/janodojivi/62232087982.pdf
    • https://s3.amazonaws.com/tokudapele/chile_fun_facts_and_information.pdf
    • https://s3.amazonaws.com/fosalizuzu/bridgestone_hoa_cedar_hills_utah.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d745.bin
2bf1d50638c6d97bafdaefe9423cd63bc3e9c78d597e9484636695e7aeeed979
pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 5252 bytes
font_01_sfnt_off0000e8fb.bin
9f7a73c5d6d3edce41acea9997e42e1af95a0aef7f141d8318d796541e54b98b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 10408 bytes