Malicious PDF — malware analysis report

Static analysis result for SHA-256 9234955090b95f2a…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 10:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 03ca4c61e86325e772ca19205930578e SHA-1: 943504ba24c19110aa5287c054e012034366cab7 SHA-256: 9234955090b95f2a8da8cc5465474dbb93389f11cd4ec53b7697d5aaec7e4f0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further payloads or visiting malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://synerhu.ru/uplcv?utm_term=download+persian+keyboard+for+android PDF link annotation
    • http://edilcfcostruzioni.com/userfiles/files/nijoterawolojemofusozugu.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/88424799736.pdfIn PDF document text
    • https://anup.bo/images/files/gowupuveduzivunelota.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/vafudovupexuw.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/sabetigenigatowebitewame.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145745c255a2---32067133022.pdfIn PDF document text
    • http://aquatherm-graz.at/files/51900839462.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/13771992847.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/78292018632.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/83751939209.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/gatejedavugepef.pdfIn PDF document text
    • https://el-tall.pl/pics/file/vepofemuxejuzav.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/49614002860.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/43663119967.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/86079864192.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219131228174429.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/34703286965.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/winorekekejiwomavebitej.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141fcdb579e0---bitagogexuda.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/60195108294.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/20138166690.pdfIn PDF document text
    • http://aquatherm-graz.at/files/15572785136.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/zufikesuje.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/buwibazozavovafiwuka.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/99127861275.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/98501856382.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/36132186678.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_off0000b5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD5 10828 bytes
SHA-256: bf1d6fe28ffaed21829ac160a67589c516192879be9474e8c5a744320787fc63
font_02_sfnt_off0000e6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 17764 bytes
SHA-256: 60ea939667f3e1225eccf15aa99030363266317bd2ba5c701c1e932ffabb53fb