Malicious PDF — malware analysis report

Static analysis result for SHA-256 473939c895473788…

MALICIOUS

PDF

99.6 KB Created: 2021-02-28 01:26:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 047966a60b1f9b70a1d899b22f1d8037 SHA-1: 2469047424ec1ebb26bbad133ab9b87e4cde1db5 SHA-256: 473939c895473788a49b951b86ade693e259bb094c8eb247a76ff0f415dccdf1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains or link farms, indicating a phishing or SEO manipulation scheme. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to potentially malicious websites.

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/strik?utm_term=brother+hl-5450dn+drum+unit PDF link annotation
    • https://cdn.sqhk.co/dexijonur/deKjgii/hd_wallpapers_1080p_download_for_android_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/c5jaqhe/peel_universal_smart_tv_remote_control_apkpure.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/the_watsons_go_to_birmingham_chapter_14_and_15_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/ghhgchg/sandwich_spot_near_me.pdfIn PDF document text
    • http://egrn-order.online/ten_minute_guided_meditation_morning9onc1.pdfIn PDF document text
    • https://cdn.sqhk.co/likamigid/YZ3ifhj/kikamajokemiruwa.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/egigjWU/hcareers_washington_dc.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/cuiehgd/kotina.pdfIn PDF document text
    • https://gagavupotiwek.weebly.com/uploads/1/3/0/8/130813998/28593c50da.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/fih3VNj/xobememuweso.pdfIn PDF document text
    • https://gixebodaloru.weebly.com/uploads/1/3/1/3/131379223/9321881.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/mikos.pdfIn PDF document text
    • http://mantenancie.com/95465423639fj92.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/lidufajekelapitide.pdfIn PDF document text
    • https://fugagabek.weebly.com/uploads/1/3/1/4/131453631/9693185.pdfIn PDF document text
    • https://rezodipegizosif.weebly.com/uploads/1/3/1/6/131606434/8309662.pdfIn PDF document text
    • https://cdn.sqhk.co/gurudulep/if3gegz/beli_pulsa_listrik_lewat_m_banking_bca.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/ghLISjg/space_drawing_perspective_by_dong_ho_kim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00014c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C92 5112 bytes
SHA-256: b5443d88f47ecda2edc28e15498dca86ded8a759082ee747f903bafb9b48d763
font_01_sfnt_off00015ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDB 10396 bytes
SHA-256: f64484cb7572d374caa78a0e87d69a5c19a228e9d4137b2d1f1a2e65bc5f0164

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