Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f8577561602fab…

MALICIOUS

PDF

75.7 KB Created: 2021-02-24 02:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1bffbfa7fe9a4b112554dae5d442c0d2 SHA-1: bb5ec578266943e58df840c5fe174bc67a4916cc SHA-256: f2f8577561602fab280900b6fe5b073421075cf262d17f7ea1eaa77ee0654b9d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for a redirector link and a high ML score. The primary IOC is a URL pointing to a redirector, which is likely used to lead users to a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=stress+management+lesson+high+school In PDF document text
    • http://goldstein.capital/what_constitutes_a_positive_school_climateagdlw.pdfIn PDF document text
    • http://guwivup.iblogger.org/62526176027.pdfIn PDF document text
    • http://lbaranaydin.com/28555765721usv32.pdfIn PDF document text
    • http://belplitka.ru/rovejaa80h7.pdfIn PDF document text
    • http://zinedoxo.22web.org/wordscapes_level_1424_answers.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/didowugorokirug/chrome_installer_for_linux.pdfIn PDF document text
    • http://botawaxugeb.epizy.com/how_do_i_change_the_size_of_a_dymo_label.pdfIn PDF document text
    • http://surotatifezuxe.rf.gd/bottomsheetdialog_background_transparent.pdfIn PDF document text
    • http://vojakevid.epizy.com/does_samsung_have_bluetooth.pdfIn PDF document text
    • http://nejovafejasujob.rf.gd/angielski_tumaczenie_zda.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/pajatot.pdfIn PDF document text
    • http://robowogutalopet.epizy.com/bewodasepigideloguja.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/12725254332.pdfIn PDF document text
    • http://morufigalolo.rf.gd/hypercalcaemia_nhs_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/pokame.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/information_integrity_classification_level_types.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/kitchen_guidelines_regarding_hygiene_and_sanitation.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/xelifobuduvugipizawu.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/avg_antivirus_android_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 5104 bytes
SHA-256: 5a206c214b4ab6b2cb3c61a7d17e849303309e282afcbbc6ffb232499e462988
font_01_sfnt_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 11356 bytes
SHA-256: 6499ac4df613e898e8c2ccd58ccef1c32dc84d2e80a77d75c9221b5582035caf
font_02_sfnt_off00011358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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