Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ff5fc8ea82fe47…

MALICIOUS

PDF

78.6 KB Created: 2021-04-16 14:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f97a14618f5eccaa84b8f12af6f6adb2 SHA-1: 20aededa31e55dc57cff6eea3b84fe0c5a9b2733 SHA-256: 83ff5fc8ea82fe47928bf44515c8e259614745e814b9efe44298ce4226beadeb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external websites, specifically identified as a phishing attempt. The primary malicious URL, https://mezovuduw.ru/strik?utm_term=how+much+does+a+footlong+sub+at+subway+cost, is embedded within the document and likely serves as the final destination for the phishing lure. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://mezovuduw.ru/strik?utm_term=how+much+does+a+footlong+sub+at+subway+cost PDF link annotation
    • http://zutatowatipo.mywebcommunity.org/que_es_el_metodo_experimental.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/mulajo.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/89646428886.pdfIn PDF document text
    • http://nimuvefote.iblogger.org/71102758034.pdfIn PDF document text
    • http://vatetuda.scienceontheweb.net/cv_assistant_administratif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e905ae2e-547d-44e2-9dcf-85858b37deeb/how_to_pack_a_shoebox_brochure.pdfIn PDF document text
    • http://ramogefakox.rf.gd/75087279906.pdfIn PDF document text
    • http://xotesevuves.epizy.com/bitdefender_antivirus_free__android.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/miponugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0297cc-67ef-482e-a8d7-6fe18ff80fdb/focusrite_18i8_outputs.pdfIn PDF document text
    • http://xajetizefo.rf.gd/perizia_econometrica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f42ea6f7-c463-4b96-b0de-6f0495d6d046/singer_20u_zig_zag_sewing_machine.pdfIn PDF document text
    • http://fisumude.rf.gd/xuxifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/879989ee-46ba-46d8-b5ac-c1ba7e2da570/little_house_on_the_prairie_season_3_episode_4.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/circle_equations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/kifomifufefex.pdfIn PDF document text
    • http://xinadapobeloj.rf.gd/us_history_timeline.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/using_vba_functions_in_excel_worksheet.pdfIn PDF document text
    • http://faganelatoke.epizy.com/antivirus_gratuit_android_sans_pub.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/2008_mercury_25_hp_4_stroke_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/why_did_saber_tooth_tiger_go_extinct.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64da00dd-4241-4d7d-8883-747f4b31b084/ikea_bed_frame_queen_parts.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/anticancer_drug_classification.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_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 5636 bytes
SHA-256: bd20d19ebc22d5add9c037b4998c9784b9a5ef4d756542d596ded70d95f1dc05
font_01_sfnt_off00010717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 11028 bytes
SHA-256: 73c6d662cc06c01d1a99d141933c707fff3fb89de6624ef0667c1406bf3fecb5

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