Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8029b78ad0eb4e…

MALICIOUS

PDF

85.3 KB Created: 2021-02-14 13:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 59901da100d1745b12479a12d5c16be2 SHA-1: 9dd5abb3ca3770a0190422b49afa29366a40cb1e SHA-256: 5a8029b78ad0eb4e61af260d9a9809ce0f79f71cfa96ed608331ca8bf199a09b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with a significant number pointing to a link farm hosted on weebly.com, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The PDF's content is heavily obfuscated, but the presence of external URIs and the overall structure strongly suggest it's part of a malicious campaign.

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://bologen.ru/wb?keyword=synthetic%20materials%20worksheet PDF link annotation
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/9136883.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374860/normal_5ff65ba446196.pdfIn PDF document text
    • http://zafogititug.22web.org/breville_oracle_touch_user_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373779/normal_5fcd68250e365.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_6004837c9188d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477137/normal_5fd96a1af1216.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472763/normal_5ffda676746f8.pdfIn PDF document text
    • http://ruvaruvifovuk.iblogger.org/hey_jude_ukulele_sheet_music.pdfIn PDF document text
    • https://sobapeseg.weebly.com/uploads/1/3/1/0/131070394/ffc75.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/zulezov/lake_como_montana_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/brighton_secondary_school_uniform_policy.pdfIn PDF document text
    • http://gusubozavagu.epizy.com/ataxia_cerebelar_fisiopatologia.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/fomubizumedinotuzew.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/vaxukaravomonuxoxuwok.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/i_ready_answers_level_g_reading_quiz.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_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 5400 bytes
SHA-256: e2fea1fcb7b4dbba4fc12d3013246e3e26dedd3db94235b8f0492417326c76f6
font_01_sfnt_off00012379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12379 10776 bytes
SHA-256: 4a1036e15949c90eeb98bd6b17bdd6c4891eea24a3c2f40c0b5a61941939fe27

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