Malicious PDF — malware analysis report

Static analysis result for SHA-256 78320eb40d64ba82…

MALICIOUS

PDF

83.4 KB Created: 2020-11-10 18:49:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 28ef07f9aa5dcb2d409490e5664ace73 SHA-1: 871cae29fac4b965162cfb52c24a462364d97e21 SHA-256: 78320eb40d64ba82b123bfeebb3866084d811c8c6776ade575c39ad190290b10
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external links, including one pointing to a known malicious redirector, suggests an attempt to direct users to harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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.
  • 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/123?keyword=gauss-seidel+method+proof In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5fa53e613addb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5f891aa76ced4.pdfIn PDF document text
    • https://masejufubalabej.weebly.com/uploads/1/3/4/3/134388341/tusaxojabux-zawekofaf-mevotejisuwob-jalofeminove.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/a6a7509.pdfIn PDF document text
    • https://jubonofu.weebly.com/uploads/1/3/4/2/134234671/kaxopatidu.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/3102b3e0-e641-4c06-b0c8-548ae57ba17b/bamasamelulugegobudilale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f580db8d-ea4b-4f61-9c50-19645f36fc74/86062224731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/949ffd50-9377-47bf-8f54-c7e26db4ee62/kojaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76deec07-1e60-4938-8370-c2e219feacfc/tenedubafebowekegatapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ed3fa1-8aaf-4d64-a2f7-461d2e591b05/33208303209.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 3168 bytes
SHA-256: 864ecbfddfd81c725698b847f1c038569dc353fedc91f9bb4ee541da1140beb9
font_01_sfnt_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 5344 bytes
SHA-256: b22f8cc0de4fbff917243d52ca52320b818ef7d1ddd11219d5e1c059132cfe96
font_02_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 13204 bytes
SHA-256: 32a3cd309e1a8cc4fdc0667fdce6ff2e306e4903850a2437b5a99930d91e1cf4
font_03_sfnt_off00012afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFB 16276 bytes
SHA-256: 78532f5993e08a82cfc9058ead70a079411fb2f27a8372f068fc82023ceb1c66

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