Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e31eb1cc5055b3…

MALICIOUS

PDF

132.3 KB Created: 2021-05-30 05:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6178fb6ac711e6a5df8a563bde8fda9d SHA-1: 9f57f840c1c75c765a494c4b2d6f6a3da6c0f480 SHA-256: d4e31eb1cc5055b361c63740356906e64af39c49ceec4be1ad98f8a726e063c3
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, many hosted on disposable domains, indicating a link farm or redirection scheme. 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 numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=eclipse+oxygen+j2ee++64+bit PDF link annotation
    • https://lewimovi.weebly.com/uploads/1/3/4/3/134311482/6879664.pdfIn PDF document text
    • https://taxezuwijukiwum.weebly.com/uploads/1/3/1/6/131606901/ef109a.pdfIn PDF document text
    • https://pipilebigomido.weebly.com/uploads/1/3/4/3/134372346/675c2c.pdfIn PDF document text
    • https://domemasajexal.weebly.com/uploads/1/3/5/3/135304114/rimanoxufipopegoji.pdfIn PDF document text
    • https://nepusonowuxi.weebly.com/uploads/1/3/1/3/131398372/junolusej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5ffe8e8a11b78.pdfIn PDF document text
    • https://xudixakutax.weebly.com/uploads/1/3/0/7/130776611/7542927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_604dc988518cd.pdfIn PDF document text
    • https://lakukuvirukum.weebly.com/uploads/1/3/0/8/130874631/pumaj.pdfIn PDF document text
    • https://zenimuxen.weebly.com/uploads/1/3/4/3/134317926/b8ec26a.pdfIn PDF document text
    • https://wetenonuvodipu.weebly.com/uploads/1/3/5/3/135321676/6830761.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365653/normal_5ffe7aaf3449f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_602ee450247a4.pdfIn PDF document text
    • https://niwuxepajo.weebly.com/uploads/1/3/4/6/134669398/sezijesimozisasugol.pdfIn PDF document text
    • https://fopidezajot.weebly.com/uploads/1/3/4/6/134688075/372a4873404f.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/01e57ba0-4bcf-4cad-ac23-6730eb4b258d/folomefesobafoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08f184f-999d-40bb-8fa8-5437fe8e418a/55854952129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b35aca-6a20-46a1-8fdc-4fc4b5879ee3/5010663234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2089c17-3273-44d6-9a2f-657ec40419da/mojukijugisa.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_off0000d185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD185 75924 bytes
SHA-256: 2be20bf3ce1a6471d543d4fb6205e32d8df1f972cbf39131d16c19604e3418bd
font_01_sfnt_off0001b592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B592 5512 bytes
SHA-256: 4a47bba8b02823db05f9482b1fdff16938e03afdb75d61165803e0d7a5347d24
font_02_sfnt_off0001c88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C88D 10360 bytes
SHA-256: ddbb84173688c83de5b0c96b89ee17d2ff45fd91967f0ec0a67c098fd7ef38ad
font_03_sfnt_off0001ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC50 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449