Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2fb74a3e998ab7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 15:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b7ea27f1cf7c5301a13fb35ec73fc8d3 SHA-1: 46e4996a30e20ebcd209963172d0dc0fb1e5b317 SHA-256: 5a2fb74a3e998ab7bd903d3dbf33349b9ac30430f613ff8ddea20709b9163e25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to other PDF files hosted on various domains, suggesting a link farm or redirection scheme. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading further content. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/kokufiminisovorewizomuwuv.pdf In PDF document text
    • https://asset-books.com/userfiles/file/zadajiluxakuwodefamuj.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/pejoxubanituwerezedajigaf.pdfIn PDF document text
    • http://hanifeugur.com/image/files/kefedeserodojapajadumoxaj.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/28852353066.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/1672014269.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/4900388314.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/fomukirabogulibufirumu.pdfIn PDF document text
    • https://businesslife.com/content/file/81769783280.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6e8af41f---58183117615.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/35198429390.pdfIn PDF document text
    • http://dfanchem.com/upload/files/95250708557.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/49914142589.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/nefevexagimeseb.pdfIn PDF document text
    • http://cissi.it/userfiles/files/35056855190.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/zalumufutotejapa.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/38111935272.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/33247320050.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/sumuvigefibixadirewu.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/musisopejosuxalolajosezab.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/lipurerewunaju.pdfIn PDF document text
    • https://bunianco.com/other_files/File/92455035572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=criminal+case+pacific+bay+mod+apkPDF 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_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 11060 bytes
SHA-256: a361420d67b3e21adee7b1c8cb49e87e92914846e649b01c8c5bb36cc5729f80
font_02_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 20252 bytes
SHA-256: 51281eecff85af265af2925d98293e44b1e3b79610665d8ac86d5874a458c064