Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae37d967f701aa5b…

MALICIOUS

PDF

78.2 KB Created: 2021-04-04 01:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d0c1275c3bd650ce27c60898da0fe976 SHA-1: c47066269494bdfd01812badbd13d870b3ff92dd SHA-256: ae37d967f701aa5bd1561294a4a9466ccd93e01ed282dd07a27abcbe222b78a0
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/strik?utm_term=is+final+fantasy+7+on+steam PDF link annotation
    • http://xuribof.medianewsonline.com/best_way_to_learn_arabic_as_an_english_speaking.pdfIn PDF document text
    • https://fakivafepupu.weebly.com/uploads/1/3/0/8/130873921/soxoro_pumona_vegafuvokuwaru_podexuneros.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/wefuzi-kujowagunamizur-jovibarilatito.pdfIn PDF document text
    • https://cdn.sqhk.co/jawefujivi/fxghDGI/17646610698.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/idjh5jc/detective_story_books_in_tamil.pdfIn PDF document text
    • http://fikebek.sportsontheweb.net/30934248598.pdfIn PDF document text
    • https://tikiruwilowu.weebly.com/uploads/1/3/1/1/131163793/wopobuveb.pdfIn PDF document text
    • https://pajapuzewufivu.weebly.com/uploads/1/3/5/3/135305216/lakemagafowob-wonelurapivonu-wipov-jogojebajuwev.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/bokuruwijakejilig.pdfIn PDF document text
    • https://simidolipuxemit.weebly.com/uploads/1/3/4/4/134486986/76e0a.pdfIn PDF document text
    • https://cdn.sqhk.co/vimofufazexe/daicXy2/bokodidepadakizasi.pdfIn PDF document text
    • https://fubolilodizewe.weebly.com/uploads/1/3/5/3/135312413/1055768.pdfIn PDF document text
    • https://pekafulif.weebly.com/uploads/1/3/1/4/131437409/4fc292.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/17316821019.pdfIn PDF document text
    • https://rusakubasarozu.weebly.com/uploads/1/3/4/2/134266120/bebixotiwexa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/how_to_replace_battery_in_roomba_500_series.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/zepiwufajet.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/what_is_the_mandate_of_heaven_and_how_does_it_work.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/47149481277.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/audacity_software_free_for_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/calligraphy_fonts_a_to_z_capital_letters.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 4724 bytes
SHA-256: 1a832df2a24a2b56be8f2820487582e6eacd4dd70be8ada8da6a6ecb9c8c7333
font_01_sfnt_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 12108 bytes
SHA-256: 55f3b8b8efe33cd650eccfcd68d1f402867514aa0eb40c7c278df729549e6ab7
font_02_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 16632 bytes
SHA-256: 87b408301c527cc8e674f70c40116a68aa1ec8767491456ae820c6a3c783054c
font_03_sfnt_off00011d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D13 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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