Malicious PDF — malware analysis report

Static analysis result for SHA-256 c894df367dde2b76…

MALICIOUS

PDF

85.7 KB Created: 2021-02-15 07:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1767bac6b5d15a3ae87d90c0b8ae06db SHA-1: b12d084292c046cbeb78878f64152a53d109ddab SHA-256: c894df367dde2b76ef8dfe82e57233873f2b5ac5411d3949dafb47091fc98393
254 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirectors and SEO link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The document body text, while appearing innocuous, is likely a lure to disguise the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://yafferge.ru/wix?keyword=the+great+gatsby+movie+quotes+tom+buchanan In PDF document text
    • https://cdn.sqhk.co/kaxonavi/f2hbfKA/thrill_rush_theme_park_oyna.pdfIn PDF document text
    • https://piworanup.weebly.com/uploads/1/3/2/6/132681558/2ecc6a2e40a.pdfIn PDF document text
    • https://cdn.sqhk.co/semejegofip/Ywn9dwG/86101090688.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/j3jblb8/international_business_management_jobs_in_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/CiaSgiy/jumenikinapuse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zobovobewuw.epizy.com/84818569988.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/mini_project_abstract_format_for_ece.pdfIn PDF document text
    • http://terofiwewu.rf.gd/xewaroxawejojezutik.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/css_profile_pre-_application_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/annual_audit_report_of_tata_motors.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/nokia_6._1_plus_get_android_10.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/3995960409.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/mystic_messenger_ray_route_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/bazepew.pdfIn PDF document text
    • http://bovubodomumid.epizy.com/assassin_s_creed_unity_gemini_riddle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/jizamutazaratuv.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/christian_songs_website.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/kesozatamem.pdfIn PDF document text
    • http://kudetewususitup.rf.gd/gatulalobafijosinur.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_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 5556 bytes
SHA-256: 5d0b335691717d90011d76b267f1d151495c3a927c5ce2cbf64456222c4d2686
font_01_sfnt_off00012266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 11640 bytes
SHA-256: 390e47512fd097fde50dca8dd1c5e75f932b79fbb9da66e57401f46457845b91

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