Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3901555bd35b7d…

MALICIOUS

PDF

68.1 KB Created: 2021-09-23 02:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f82b7b6752b113d915a3950b35301a06 SHA-1: a9a24b1e96e7304ca89f9c8f79da9b68caf7c7e4 SHA-256: fd3901555bd35b7d8baf67eeaf5be0f797a2a6fddf5b21bd3c4f479cf73e0d88
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including an image-only presentation and a click-outward action to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded URLs suggest it is designed to redirect users to potentially malicious content or initiate further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=worms+3+free+download+android PDF link annotation
    • http://bacvietexpress.com/upload/userfiles/files/98968657033.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/vugosizezuzofitedowujugox.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/54693533016.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/dezokok.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/89756940702.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/070307_venipa.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/xigufubome.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/lavidok.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/75624879778.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/suxakaxifipuwejavi.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/najubozigasanak.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/sijevuronil.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/parowawovobetigobuj.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/kezogasipuvo.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/danulamagemijo.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/razagizodupadigun.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/bebixekumapamu.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/bagupadezegazogusiv.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/zufolefelom.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/dipemo.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/wufuvagizumokisewasibeja.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/46626638880.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/soputuzaz.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2d9skr66nhb6154ejkohibiag5/xunozuka.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/zenipasatuzepaxubigipoka.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://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_off0000af48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF48 10668 bytes
SHA-256: 9bd07a7a52cf770b7131badf374b8329ce1a3eba487c3fd18d196d0fde869080
font_01_sfnt_off0000c7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C4 14236 bytes
SHA-256: 2395b11447b0f92019611c081863cce64ce4193afe901caf2e0b5950be52b77c
font_02_sfnt_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1