Malicious PDF — malware analysis report

Static analysis result for SHA-256 502145c946a3b68f…

MALICIOUS

PDF

86.0 KB Created: 2021-04-05 02:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ca94fcd40163e33203ce9c471ea141a7 SHA-1: 12f77d0ae11fb179c19f0e0f3fbab514da69b5ce SHA-256: 502145c946a3b68f46770cd88f758d2ab68e84ece70c6e11e624176e8cfef39d
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/strik?utm_term=the+end+hot+sauce+heat+rating PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496153/normal_6033ad8d7182f.pdfIn PDF document text
    • https://vutuzanepe.weebly.com/uploads/1/3/1/4/131453188/7063810.pdfIn PDF document text
    • https://givenuwijuzi.weebly.com/uploads/1/3/4/4/134445792/gebafoxasiximime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_5fe880fdce727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_605c743d96a12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403417/normal_6040f95c3402f.pdfIn PDF document text
    • http://fatunatet.getenjoyment.net/mazidebinilosaralepij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462059/normal_600408d17d461.pdfIn PDF document text
    • http://kuvezowepo.scienceontheweb.net/football_autobiographies_free.pdfIn PDF document text
    • https://kujepilam.weebly.com/uploads/1/3/5/3/135343620/603256.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/60365566897.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
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_2280078abf3943bc9ff483c002a14573.pdf?index=trueIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_3eb45e3ab4af4a9aa2f8bbe0b4366df1.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_04fc25b90fb148519acfb7aa1b2ee77d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f95b020-f86d-4452-b06b-498b3cd8079e/the_silence_of_the_lambs_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ac18770-1724-4fc3-a4b1-b97d69065239/my_craftsman_pressure_washer_wont_start.pdfIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_edb91bea9cfc47c7883654a612c318b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98acccf8-421a-40c7-a7c9-c9ed62a4fb7a/gagarolisokenofisapadovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce617a5-0a15-4349-9a3b-c97854812b4f/18789673331.pdfIn PDF document text
    • https://2521c3e2-5736-45bb-9381-71005f2ffa37.filesusr.com/ugd/c85705_84cfc10c2c2048fa9571154526207c7a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 5000 bytes
SHA-256: b73e736496a147487421db58ba7dd3ca9854b68d9389d3e4cd5bae663906fc59
font_01_sfnt_off000113bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BF 11496 bytes
SHA-256: 16d500798575ce4ef5fb709905146d759b2070ebddf177c75444195648a7ccf2
font_02_sfnt_off00013aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34