Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea97144509343bb2…

MALICIOUS

PDF

76.2 KB Created: 2021-02-24 01:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 02d1f95b97934e437bd65c22308e679c SHA-1: c1d565abb83046b75b04edae7832b9f7b16121e7 SHA-256: ea97144509343bb22a7cd1548d87f96505b7434bdb75b44cb53128c4f2687bbb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of embedded external links, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title that could be used as a 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://jottigo.ru/strik?utm_term=how+did+western+european+culture+spread+around+the+world PDF link annotation
    • https://cdn.sqhk.co/ximosufi/ifSJUfa/fold_up_chairs_for_sale_near_me.pdfIn PDF document text
    • http://dogosufomume.iblogger.org/lurer.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/he6ffje/34916181261.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/nopajukakabomar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_602ba93e6ad03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391047/normal_5fe645c8a64d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_603581202d710.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492871/normal_5ff0e3682386f.pdfIn PDF document text
    • https://cdn.sqhk.co/jirozixo/jcqiihe/13857424552.pdfIn PDF document text
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/fepexavakoneza.pdfIn PDF document text
    • https://gikovasedubum.weebly.com/uploads/1/3/4/5/134507074/7973585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_5fe9726586a18.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/fivebo/walden_2_bf_skinner.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/booster_cleaner_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/resident_evil_movies_collection_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/atmega32a_datasheet_complete.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/84203554274.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/common_journalistic_reporting_practice.pdfIn PDF document text
    • http://xunevonobi.epizy.com/plague_inc_full_apk_android_polska.pdfIn PDF document text
    • http://kujujigufa.epizy.com/55323432359.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_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 5212 bytes
SHA-256: b0267ff637fe0e32d9a7ac86b20605cfd4dc1944170dec647eb4f669cf421643
font_01_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 10204 bytes
SHA-256: 6741bf997939075279dc61df2c88e1057cc566da6a837a1a084eb5384b3696bf

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