Malicious PDF — malware analysis report

Static analysis result for SHA-256 c675324d11450a12…

MALICIOUS

PDF

80.6 KB Created: 2021-05-06 14:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 019af8b45465ccb39d048613ba16335d SHA-1: c00df5cebe878d871ecc75092f6d978538865fa6 SHA-256: c675324d11450a1220c5391646cb4641f59090e1a16466487e205c5b5ec82993
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link-farming attack. It contains a large number of external links, including a suspicious URL pointing to 'jacksth.ru', likely intended to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to 'seven step model ethical decision making' and references wkhtmltopdf, suggesting a potential lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=seven+step+model+ethical+decision+making PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501501/normal_6013c9bee340e.pdfIn PDF document text
    • http://poruzotosiku.getenjoyment.net/defidulitanukavaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410983/normal_6041790b9a7aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_60400aec23a23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484997/normal_5fc9e8aa7702d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447649/normal_5fe25d85153b4.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/Xib0nLK/characteristics_of_a_good_mathematics_teacher.pdfIn PDF document text
    • https://cdn.sqhk.co/ziriziwebu/NhhS0ia/17292619152.pdfIn PDF document text
    • https://cdn.sqhk.co/vewimidipiv/rhcLcge/38608229694.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/yUIge8p/rapunzel_tower_toy.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/CV3ihgg/60141863473.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/bedobaxolezuzipaxudabu.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/latest_bollywood_movies_2018_free_300mb.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/grandfather_clock_sound_effect_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/53699486556.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_b3ab2185c4644116b661f5f74480d46d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/bivavera.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_b7bdc223e3794ff09a5adebd15589e4f.pdf?index=trueIn PDF document text
    • http://moxixezegosa.onlinewebshop.net/vocabulary_in_use_upper_intermediate_with_answers.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_db56b98e10bb44f586b91e385aed80b7.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_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 5616 bytes
SHA-256: 7bbeadb0feb638941996f580c68390949bfab7c5e6e441a3a98c52ccf8d96d73
font_01_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 11760 bytes
SHA-256: da9834eb5c71b82e2c68733277ead1294849b16ad16d10177f4c88a6eaa8e39b

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