Malicious PDF — malware analysis report

Static analysis result for SHA-256 f513122d07f5352d…

MALICIOUS

PDF

82.8 KB Created: 2021-03-14 18:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 002c372756ac41f603a438f17e3ab731 SHA-1: e7d6cce7d7d0b8320d091e8995b0518ea31f2326 SHA-256: f513122d07f5352da9f13f98b7d1c7c8305a5ac2edd504e386f3fc16c516b65a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, likely for SEO manipulation or to distribute further malicious content. The presence of multiple disposable hosting domains and a high number of external links suggests a phishing or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=admixtures+used+in+concrete+pdf PDF link annotation
    • http://forezofulafenu.iblogger.org/47171509901.pdfIn PDF document text
    • http://mikazuxo.mypressonline.com/71927761202.pdfIn PDF document text
    • https://rejomopoxe.weebly.com/uploads/1/3/1/3/131383333/sajatur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476146/normal_5ffe29999aab2.pdfIn PDF document text
    • https://xudufuzed.weebly.com/uploads/1/3/0/8/130815664/loxokuselu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417314/normal_5ff84ebd01596.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/motimekirax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496146/normal_6022784a6f8b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470964/normal_6007a818f0b9c.pdfIn PDF document text
    • https://wofexajolevesi.weebly.com/uploads/1/3/5/3/135302186/sorinijegimefarik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465127/normal_5fef58399df03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_23b736f04b3f4eb6927a79d536743fde.pdf?index=trueIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_678a76761eee465e881943eee64e3d03.pdf?index=trueIn PDF document text
    • http://zogivoti.epizy.com/gineselukoporijuwevejekus.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_552686721e664e9d8a8610bc00259a51.pdf?index=trueIn PDF document text
    • http://lelexuxifu.epizy.com/58306420691.pdfIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_66af977571b243909dcdb8c4b2deddfe.pdf?index=trueIn PDF document text
    • http://gumusimigogasuz.onlinewebshop.net/53638135378.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_37d7b94a34e44bbbbed2bc62ad540788.pdf?index=trueIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_28207cca2824456aa899dc0fa9b384d9.pdf?index=trueIn 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_off00010488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 5116 bytes
SHA-256: 9c133bc66bcd5ce5530baf16a76cb3306118fdbc08ffa453a4515c5fd2d81d00
font_01_sfnt_off000115e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E3 11340 bytes
SHA-256: 8405df0ffeb5ef948c0453f621e971dcc6665ed5377659001b1b4288f27dc7f2