Malicious PDF — malware analysis report

Static analysis result for SHA-256 940ae16c61777af4…

MALICIOUS

PDF

70.2 KB Created: 2021-06-06 05:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c5bc08640141500a949840f6abdf998e SHA-1: 4b6328efe83e8e8fff72361d31caf2ff5b7825c9 SHA-256: 940ae16c61777af43b97f289beee381323d0919c3b963f64e28cc151098f598a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The embedded content, though obfuscated, likely serves to disguise the malicious intent and encourage users to click on the external URLs, such as https://crewmak.ru/pbw?utm_term=mixture+vs+solution+worksheet, which could lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://crewmak.ru/pbw?utm_term=mixture+vs+solution+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485703/normal_5fe65197a8aa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491670/normal_603a5dc1858e0.pdfIn PDF document text
    • https://tezonebikinigax.weebly.com/uploads/1/3/1/6/131637870/xozafenupuxi_fovinelajubam_megek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_600fddfe6e6c9.pdfIn PDF document text
    • https://xunimolozabipos.weebly.com/uploads/1/3/2/6/132681728/1a42c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5feb20dcd0948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_60146fe087c56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5fd26627a0fda.pdfIn PDF document text
    • https://lijafaxad.weebly.com/uploads/1/3/5/9/135989690/2892544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_601442a347121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_603b9086339f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470962/normal_5fcff348e04f7.pdfIn PDF document text
    • https://penukigoguni.weebly.com/uploads/1/3/1/6/131606127/jifuluzusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_604ec6012217d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_5fe90b579bc62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496824/normal_602103c8ab351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458431/normal_605a4279cb377.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/c6b83b3b-5939-4c85-b103-a93c5f4a1414/jisorefol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80155fa6-f1bd-4477-9ea8-c8f543a2461a/sajikinujuragevixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fadefbdf-4e71-4795-b82c-202c8eb544a4/on_the_road_truck_simulator_ps4_pre_order.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 4852 bytes
SHA-256: f42570bed3aafa6bef5a7cc80bd72811dbbd46d59d416eae9c4384d545df9d0a
font_01_sfnt_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 10344 bytes
SHA-256: 53bc399b900c99d1ff8632559c1eb690d14c4f1cc5a3d5c38cb606bfe64507fa

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