Malicious PDF — malware analysis report

Static analysis result for SHA-256 4448a2b206ba046e…

MALICIOUS

PDF

77.7 KB Created: 2021-03-20 03:12:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 93691184198ac789e529f36ed741325d SHA-1: d59afedf0619417bb704fc210a1dfdcee1ca332e SHA-256: 4448a2b206ba046e9c29ef758467f05580af298d996c695c7c29fcf1d7faa772
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are SEO-optimized and redirect to potentially malicious sites, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK heuristics. The primary malicious URL identified is https://gimoguvi.ru/123?utm_term=belfast+city+airport+arrivals+information, which is likely used for phishing or to host further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/123?utm_term=belfast+city+airport+arrivals+information PDF link annotation
    • http://instapresent.site/48730277634zyoqy.pdfIn PDF document text
    • http://ita-yog.space/forumufidaguwoje80hgb.pdfIn PDF document text
    • http://prequester.online/39296498849hm577.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/fGUgIgf/police_pursuit_tire_grappler.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_601cd1ab62966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485702/normal_6039c40368744.pdfIn PDF document text
    • http://handler-autoscout24.com/2015_ashrae_handbook_hvac_applicationszysfc.pdfIn PDF document text
    • http://consequences.space/xafasuwijubovifempoo.pdfIn PDF document text
    • https://cdn.sqhk.co/ramejolir/hgcKrhe/print_email_iphone_epson_iprint.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/kovozenamofox/votefol.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/rutezakumizixiban.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/12437264474.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/gymnastics_score_sheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/chhath_puja_song_dj_shashi.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/14314278137.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/junuwogetixepum.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/35415534954.pdfIn PDF document text
    • https://6a543b89-810f-4a07-932c-4cc129fc401a.filesusr.com/ugd/1e5726_2f521505eae546498fa6e16a621eaa59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/novifamigot/free_bootstrap_template_for_home_page.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/siset.pdfIn PDF document text
    • https://43dda2ad-fadc-418c-a2d5-4b96cca2ed60.filesusr.com/ugd/6eca9c_d17bdcf7656247f0bb4de59dc62d3f61.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_07ffb3ffd6fc4487a7ed79534ba2f516.pdf?index=trueIn 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_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 5372 bytes
SHA-256: 41ec042b667ad6aa8d3af3be17fe9f50fa35c7c67c301192e99cf5911d8d78be
font_01_sfnt_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 12320 bytes
SHA-256: ad0b03bf0a5bc806821bcef49e39dacc58a089c8fa8f11d9d7a392dab1fceb41