Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbd626bd84ba3d1…

MALICIOUS

PDF

67.4 KB Created: 2021-01-17 05:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b4d23a84bb643e316d90b3ffc36d0388 SHA-1: db1ceb64d824af86d6ab45743ceb2b669e353a46 SHA-256: fbbd626bd84ba3d1fa9c1dbe4198a28e26e7654cf247a211c8ec40663b4b1207
186 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 domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffe.ru/123?utm_term=k+ration+cigarettes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375209/normal_5ff92ae8cb03a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_5fe61974b19e8.pdfIn PDF document text
    • https://site-1180467.mozfiles.com/files/1180467/sawov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405902/normal_5f9340a88a57f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481168/normal_5fdc86dd01d9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380869/normal_5f9860436b0b2.pdfIn PDF document text
    • https://fizozedodid.weebly.com/uploads/1/3/4/4/134484686/a72f41afb040.pdfIn PDF document text
    • https://riwewupurudo.weebly.com/uploads/1/3/1/3/131381540/lojelojulabuxede.pdfIn PDF document text
    • https://site-1177606.mozfiles.com/files/1177606/popular_songs_of_the_50s_60s_and_70s.pdfIn PDF document text
    • https://site-1177840.mozfiles.com/files/1177840/samsung_galaxy_s4_covers_amazon.pdfIn PDF document text
    • https://site-1176294.mozfiles.com/files/1176294/96548695020.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_off0000cdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB3 4904 bytes
SHA-256: 147b64483f9eedd3c115b71afb59d3fe76d5878b3cf96e053db262b27856ffb8
font_01_sfnt_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 10356 bytes
SHA-256: 3574adc85d6e8e35f5039b996b6a49e32d052ec1513d303e53529bd574c0231f

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