Malicious PDF — malware analysis report

Static analysis result for SHA-256 9077a9c918f2b23d…

MALICIOUS

PDF

89.5 KB Created: 2021-03-18 13:16:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 30fe83b262481d79641ce4eab887cba4 SHA-1: ab926dd306b834f21e02a7bbd001e37f9042935d SHA-256: 9077a9c918f2b23d4df9f45a9a46dfc3aba01a9b8004c3b94de8d6717f8a01d2
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a link farm designed to redirect users to malicious sites. The primary redirector URL, https://mezovuduw.ru/wix?keyword=best+breakfast+spots+in+key+largo, is presented as a search result, a common lure for phishing or malware downloads. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://mezovuduw.ru/wix?keyword=best+breakfast+spots+in+key+largo PDF link annotation
    • https://cdn.sqhk.co/gixenako/jegdX5f/exponential_notation_worksheets_grade_7.pdfIn PDF document text
    • https://tatisosef.weebly.com/uploads/1/3/5/3/135333589/pugezavabejored.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/hbhgFjh/iphone_weather_app_default_location.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/buriduzuvi.pdfIn PDF document text
    • https://rapugudunoxe.weebly.com/uploads/1/3/4/0/134012743/terol.pdfIn PDF document text
    • https://rukinuzozumar.weebly.com/uploads/1/3/4/0/134012371/nazokekisiz.pdfIn PDF document text
    • https://susominen.weebly.com/uploads/1/3/4/7/134714937/7908920.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/Jge8jgl/xixelizebufekineki.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/vefagotoje/bazadozasunideli.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/68111985109.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/86864738941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a4d1f4-89d2-4186-8335-cdbfdde082d9/gujumexogogelezuzeton.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/23016552040.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/litezoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f226436-f9b3-41d8-a9f3-98ac08ad5540/what_is_cognitive_bias_codex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/107ded3b-665d-450f-9093-96f856a3526e/famizanewugovalenoxorota.pdfIn PDF document text
    • http://jenuvuzawo.epizy.com/basic_accounting_interview_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/11635949286.pdfIn PDF document text
    • http://tagugatukosag.epizy.com/85201388508.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/firokamalidaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ea2b487-da94-45e0-8567-690bac97e962/xelafevasiwitosuxilam.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_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 5424 bytes
SHA-256: a0c7f6797fc8e468cf2c7aadc14fb4a7e3c49168a2efb0d918fce142ec5f9860
font_01_sfnt_off00010dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 2528 bytes
SHA-256: 43c07e8218cff881d23c0787f672493a2c03c2cd64513c413257e543e811ea1f
font_02_sfnt_off0001187d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187D 12044 bytes
SHA-256: 108b6cc9b574c50cdcb231c3606592fad3d6283b154b0ed7d4cf63f2147081cf
font_03_sfnt_off0001407e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407E 16392 bytes
SHA-256: 8976f08d19289f394670e95003dbd7e43d40ab5e55cac77d8d2bd4f89a3a4620