Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a577cd0220ec75…

MALICIOUS

PDF

71.8 KB Created: 2021-02-18 23:27:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d0bcbcc96c468d69c21336f75862d028 SHA-1: b42577e07e22e70d07deb76fdbd16bf8e38d1295 SHA-256: e5a577cd0220ec7551b46e1f8b2129f6524b8419de0cdd521f9819fb999726e0
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious sites. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the nature of the link farm and the presence of embedded URLs point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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+much+does+handwriting+without+tears+cost PDF link annotation
    • https://cdn.sqhk.co/wujamufaw/ggdajdn/brain_balance_plainview_reviews.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/4387768.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/hcMZmMJ/guzugasapuvoxix.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/gjjhbJ1/bozokev.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/Ahhlvha/sibukikamunojol.pdfIn PDF document text
    • https://kopaluzakiletal.weebly.com/uploads/1/3/0/7/130739322/4899534.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/uheicje/black_christmas_1974_full_movie_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/jijgjiX/riders_on_the_storm_lyrics_skald.pdfIn PDF document text
    • https://cdn.sqhk.co/fotajoge/hfhaQjg/sazerused.pdfIn PDF document text
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/9782484.pdfIn PDF document text
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/90fa4360fc.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/nunakixuma/calculate_percentage_increase_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/all_sheets_visible_vba.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/27524143649.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/kakitefugaweligo.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/apental_calculator_liker_app.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/kaabil_full_movie_480p.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_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 5372 bytes
SHA-256: 522687a37278ed4f331e67c1439bcefdf6fdbce33dadc4c3dddde4d691ba6d7e
font_01_sfnt_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 11716 bytes
SHA-256: b88b0e4fe31d64b51bcc7f137846047e79405b62bb98da4c7302601b093ddde8

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