Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b329bd75fdde8e1…

MALICIOUS

PDF

83.3 KB Created: 2021-03-04 08:49:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aef7b17d8a82f41c3ed6c3ffa179244 SHA-1: bc83aa6d26505b9af497080944a7b0cafb3a3b83 SHA-256: 4b329bd75fdde8e18c34559e5aa3282edf0d5b0ccfa5e6e84e89a0b4d07005a6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL being a keyword-based search result. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm and potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=giant+steps+transcription+bass+clef
    • http://jalatuxu.iblogger.org/81442228396.pdf
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/nakanowuwifek-bisaxegalifudep-rurememek-jofibi.pdf
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/4510248.pdf
    • https://futilupotozuvat.weebly.com/uploads/1/3/1/4/131454482/fezakapokuje.pdf
    • https://bezujaseda.weebly.com/uploads/1/3/1/4/131437953/gudejelar.pdf
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/5437101.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dogamesesokuj.rf.gd/canadian_nonimmigrant_visa_application_form_jamaica.pdf
    • http://molagegivijoxu.onlinewebshop.net/76906654311.pdf
    • https://s3.amazonaws.com/tazibabebamep/7359571824.pdf
    • https://s3.amazonaws.com/dejazuvorira/survival_kit_amazon_food.pdf
    • https://s3.amazonaws.com/sinadi/mareludipiratokorowogadu.pdf
    • https://s3.amazonaws.com/kumasala/whatsapp_apps_apk.pdf
    • https://s3.amazonaws.com/gixawetopoli/sulatodovuruxesatakeza.pdf
    • http://sumewapedujevi.rf.gd/how_do_you_know_what_size_water_softener_to_get.pdf
    • https://s3.amazonaws.com/gebukil/weight_lifting_techniques.pdf
    • https://s3.amazonaws.com/wupixufekijax/25791691278.pdf
    • https://s3.amazonaws.com/bejikefowu/zagalafipedab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e231.bin
8e06db94ac703fa114ed0f9f6d00db2cd39f236ca2d8da1373954a23a14bae54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 5180 bytes
font_01_sfnt_off0000f3e3.bin
19037b56cf834db213fa3f96df89caa1b3e8656a2d1eb827caf222b1d982d971		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 16496 bytes
font_02_sfnt_off00012831.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12831 16204 bytes

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