Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7b2df2ba0d4cc5…

MALICIOUS

PDF

83.5 KB Created: 2021-05-15 22:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0c7865e463fe2a4519f76a4fbd22baf4 SHA-1: 2c193b5efcaec96d28642265752a85ebe54e6877 SHA-256: be7b2df2ba0d4cc5530d7a57589de7913ab9c52210471721529fc1e38bcf6a9a
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, suggesting it functions as a link farm to distribute malicious content or facilitate phishing attacks. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to harmful sites.

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 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://nipisod.ru/strik?utm_term=2005+nissan+murano+power+window+problem PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404959/normal_6053ecf150a95.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/ifEgggi/orexigenic_and_anorexigenic_pathways.pdfIn PDF document text
    • http://zotaforiximom.22web.org/reynolds_adolescent_depression_scale_2nd_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/baveninale/giggKjf/23362417609.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/gibhfji/best_free_wifi_analyzer_app_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458826/normal_6063d091f1514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501963/normal_605cb0e287ef7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bigibejunewolov.rf.gd/be_smart_english_workshop.pdfIn PDF document text
    • https://04fc2a56-3ca8-4b90-bfe8-b05f9e7ed3d8.filesusr.com/ugd/51e9d0_045e80126bf249c9bb186386b19794b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb4da8a-bc77-420f-8c55-7ae9c33d70cb/10981916571.pdfIn PDF document text
    • http://befojarariwowab.epizy.com/chemical_principles_peter_atkins.pdfIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_3a7d9e7ff46f4dc586b53fa5d34d9727.pdf?index=trueIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_984e1784bbc242a3ab26ae2e28a2461d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kisagoz/34548706284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70fce7a2-8e3f-4299-9a76-af2731238c60/sitivomugolakapanobez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e8008e4-eafe-4bce-b586-0cd359a4452d/37747099576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a46c02d1-03e1-455b-ae37-26849939bc1e/what_to_eat_to_beat_depression.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/ap_us_history_textbook_american_pageant.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_6b520ccd00384320ab0ef90fb1e80d33.pdf?index=trueIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_93226aa797e14519a8e879c9e0f26b3f.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_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 5640 bytes
SHA-256: 40761a7aa90030c681ecc7fde293bcb4654cd9cf2c450711cad19c0f9dabc58c
font_01_sfnt_off000116ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 11688 bytes
SHA-256: f23a696aa690f1cc193294d4d0370fee1d941de626b8c1af28558089f3f0e052

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