Malicious PDF — malware analysis report

Static analysis result for SHA-256 258c5f971a83a9cb…

MALICIOUS

PDF

79.7 KB Created: 2020-11-10 07:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: aa7aff6244b90b17c8984433d9ec7998 SHA-1: db9c442e1abbe8df314e83f68df249f3f14a30e7 SHA-256: 258c5f971a83a9cb3fbd46c187921cfb60ed4bc93be40470f7556fd6ad276292
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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.
  • 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://traffmen.ru/strik?keyword=15400-plm-a02+filter+cross+reference In PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/9358178.pdfIn PDF document text
    • https://bavawodefa.weebly.com/uploads/1/3/4/4/134445913/95272e67500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392667/normal_5fa61de1dee68.pdfIn PDF document text
    • https://nimijakis.weebly.com/uploads/1/3/4/5/134577625/ninenalos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_5f8cc2e808187.pdfIn PDF document text
    • https://varavedonenen.weebly.com/uploads/1/3/4/3/134316352/1787727.pdfIn PDF document text
    • https://nunezexivu.weebly.com/uploads/1/3/4/4/134440215/wemijizatidavap-xefalasezo-nuxugorela-pivapepokamapi.pdfIn PDF document text
    • https://gulatavinijigu.weebly.com/uploads/1/3/4/5/134507109/3434343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_5f9e7e5ec9151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f9aae4573069.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/17867b0b-8a1a-4e69-a45c-b5423227c66c/zepuxiwudidiguvox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb6cb57-9071-426c-8e46-dd345999f2f4/atlas_de_geografia_del_mundo_5_grado_paco_el_chato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/792a9051-b510-4a03-a4c4-fbfd50060717/37531163551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6020218d-24fe-4a0d-8a65-56defda86d2d/community_christian_academy_in_paducah_ky.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000d0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DF 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 5636 bytes
SHA-256: 9a2ddbef389a1112715188ea429c10f6d81444e3956968d60dcad57e4d609056
font_02_sfnt_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 11444 bytes
SHA-256: b72d33e825948acd4393e461136b9f372e1d0480d5e780db822a9490e631458e
font_03_sfnt_off00011c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67