Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fd4531ea9e0e6a…

MALICIOUS

PDF

81.8 KB Created: 2020-12-28 00:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 27f25e0e17dd8a6c0805f3c212d94fb1 SHA-1: 2f6b23a2ffd5e11cbae4e0e22759b4f32fe7cf02 SHA-256: b4fd4531ea9e0e6a9bb0e7822b83c8cfe4b2381abde60833a83edb8ac24d1afe
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/strik?utm_term=bunny+bubbles+and+beulah PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425514/normal_5fbc762fab909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5f8bcd2627324.pdfIn PDF document text
    • https://juvirafiwak.weebly.com/uploads/1/3/4/3/134307718/4ee50fe822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451929/normal_5fc442c934a4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_5fda4f5cd0bdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447631/normal_5fc8160f23479.pdfIn PDF document text
    • https://zasisenixe.weebly.com/uploads/1/3/4/6/134632294/190cc2dc6af9547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450430/normal_5fc4bd1a835be.pdfIn PDF document text
    • https://xarupome.weebly.com/uploads/1/3/4/4/134469096/1065967.pdfIn PDF document text
    • https://cdn.sqhk.co/tivomepu/DstCrhd/dupudaguwovotazazijubeva.pdfIn PDF document text
    • https://dexixafavako.weebly.com/uploads/1/3/4/3/134348567/nufenolinolejiwevu.pdfIn PDF document text
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/nulinizumovej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368971/normal_5fa9d394abd5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412761/normal_5fe5c357efe6f.pdfIn PDF document text
    • https://nugekepujipa.weebly.com/uploads/1/3/4/3/134318644/rusifuwibi-xumidobuwam-lexikekab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 4752 bytes
SHA-256: 3d34343466db9c5d230d2eb0def46029e96bc210c466aca48d67c520a4a689af
font_01_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 3448 bytes
SHA-256: b5de1815a74242d9b5241004c63de6212634a0e6bd396fc1b4922dfd73848ced
font_02_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 11564 bytes
SHA-256: 38e6145d9b2b7457de5d42604a077ae24a6ecc969490f47ba1b935bb89a2dcb6
font_03_sfnt_off00012b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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