Malicious PDF — malware analysis report

Static analysis result for SHA-256 1967eecdb8f397c8…

MALICIOUS

PDF

88.2 KB Created: 2021-04-22 00:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b7c250d208302da0620493e0b906431d SHA-1: e397fde4cdc2a391257b8a724a6f494a9bf28fb3 SHA-256: 1967eecdb8f397c8fa7d3df9a02e7550e3646814287a89aaa7e62ef1c2df8c24
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. The primary URL, 'https://zajinet.ru/strik?utm_term=what+are+some+popular+and+important+elements+of+poetry', suggests a lure to disguise the malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The presence of embedded links and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=what+are+some+popular+and+important+elements+of+poetry PDF link annotation
    • http://tehnotop.space/dawegovemuwublh2a.pdfIn PDF document text
    • http://avit0.pro/kemavegusepuwizlyx1b.pdfIn PDF document text
    • https://cdn.sqhk.co/funixatugesi/mPFvs9a/fury_warrior_talent_guide_classic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_6015ddb8e7234.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376866/normal_5ffb2fb9251df.pdfIn PDF document text
    • http://itdiscount.info/tutafikalohwyze.pdfIn PDF document text
    • https://cdn.sqhk.co/zonelatu/cLOjije/gravitational_field_strength_questions_and_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450003/normal_5ff7de0792a59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_603507b11e671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_60618808e1ff0.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://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_0f6e9311200f4127929bc2d7c9e746c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xozeb/kixibebituxofop.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/install_sap_fiori_front-end_server_5.0.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_a9b023b53a4a42dd8e99731743366c1c.pdf?index=trueIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_e7986b25613d45b2ab31bca08cb01817.pdf?index=trueIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_085b1579fd28470192f2197cf57e0d12.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_e197fa711b3f461488efbbea64722c5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sukedil/drowning_shadows_piano_sheet_music_free.pdfIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_0ea32c4131e149a198516f3a2a3c456c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/puzitimiranu.pdfIn PDF document text
    • https://fa0867c9-8cf0-46f9-bfae-aad8e49c21f3.filesusr.com/ugd/cdba2c_6b291f9ef5224974aeda462dafb79d38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/7390288172.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_39d10c8e17634d198b5f5594fa7edbf9.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_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 5276 bytes
SHA-256: cf61f09a36de4fe95c663aab2b4d0c30aa0f90a31ebd82208c1b3d9d05543ea7
font_01_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 10528 bytes
SHA-256: 6228017c013cc657b42b6f02fa2acaa1732e98cb03199ed1194b6a5ffd9010cf
font_02_sfnt_off000142f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378