Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1d392a8741cd1d…

MALICIOUS

PDF

72.7 KB Created: 2021-03-20 00:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecba7d8c14c9a23ae9d8c19d40fffae4 SHA-1: 4c84e72a12c1fdc2a3955f21da2cf9aeff9f4da9 SHA-256: 1f1d392a8741cd1d8f2288963f727005edd23a3ae2e5f71acc8ae2b3c82fbcf0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as academic resources, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or leading users to phishing sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=solving+graphing+and+analyzing+quadratic+functions+worksheet+answer+key
    • https://jototafedapabo.weebly.com/uploads/1/3/1/3/131398279/7314108.pdf
    • https://cdn-cms.f-static.net/uploads/4480876/normal_603366dd42ab4.pdf
    • https://paraminukus.weebly.com/uploads/1/3/4/7/134705680/8e65f5617b.pdf
    • https://cdn-cms.f-static.net/uploads/4448339/normal_5fda7b385b31f.pdf
    • https://cdn-cms.f-static.net/uploads/4475872/normal_602058da88095.pdf
    • http://kizisuruz.22web.org/43683588802.pdf
    • https://wutosalix.weebly.com/uploads/1/3/4/6/134635680/2771071.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://getidevip.epizy.com/12924099959.pdf
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_4fb6394d2a934862a4700d58da745911.pdf?index=true
    • http://vudatuvabejosix.epizy.com/50787923471.pdf
    • http://valebuwevunav.epizy.com/xigotozanotejegajuw.pdf
    • http://xarififipevi.epizy.com/database_management_system_quiz_questions_and_answers.pdf
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_33ce503c5c784177a81481b1cdeaa28a.pdf?index=true
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_93b4a435544d457cb12d819ea9f0b1a9.pdf?index=true
    • https://dce09894-55e7-49e1-9c43-b94069c58f23.filesusr.com/ugd/11ae40_62277e18f3094004a5699e56d576858e.pdf?index=true
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_dd227353aae648c6a7ad2b7c367eb749.pdf?index=true
    • http://dodujorumapide.epizy.com/freckle_juice_questions_and_answers.pdf
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_b8310bed22604acb8abda8521f747a1e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb16.bin
5b8d04c966fb85864465764ffc13c10223ca16b08d1fc07a99465ab38ed8536e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB16 7000 bytes
font_01_sfnt_off0000dd00.bin
12b215eb227e28f6c4e35b806cae018c809f36bac573559355b65e1c26190910		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 6016 bytes
font_02_sfnt_off0000f192.bin
f88867ff435f1b676a3a855964a5ff8222bc5e1e81b4dd309aa1d388ad911e3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 10124 bytes

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