Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c11ec2994fc240…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 07:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f8ca5352c3a4383a835ea11ce613e84a SHA-1: 0a1b9b838a112ef8c3f9524ee955731b3ad9d977 SHA-256: a2c11ec2994fc2400912f01e9b513039cf36766475b4a7cb69409bc9ca2cb778
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://sharmtocairo.com/userfiles/files/lavorumorelezaxugurol.pdf In PDF document text
    • http://zavalinka.by/var/upload/file/nipevajimaxujetumub.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/xobemidalufetigaforujen.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/43693224009.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/fatiribesus.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/23537611793.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/74595503060.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/vubuvuketarixufigef.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/xasoxesijok.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/68286927190.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109140502074646.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133e9fa09233---24520326396.pdfIn PDF document text
    • http://xsteelstock.com/d/files/wulivixapegep.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/woxuxoxun.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/modemibabinimakejobejuma.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/buret.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/94460832714.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/72332230562.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161367e2bd4856---melowemojidizewivikotupen.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/velepujonalodegekepexenek.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/pibajoxesezobumupe.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/gepajol.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/43798389451.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/zapatosi.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/tugetiwujiwekezixesav.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/wusasazolojatigenovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=iphone+11+price+in+bangladesh+2021+unofficialPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD37 17776 bytes
SHA-256: 4885d2100672e89d1759f20610b0ebc5bcbea7248809b4a477f21136ab1b50e1
font_01_sfnt_off00010b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B61 11288 bytes
SHA-256: 82370650476db7cf33b6bc6cad0e4aa0f7aa5988907189591610320a65b0bec6
font_02_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1