Malicious PDF — malware analysis report

Static analysis result for SHA-256 857e9c8c913cde96…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 08:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c19e2f4ecdb97cb5462325b7bfe7f79 SHA-1: 696033b4c544c9aa28de204511e3e15a9c9813f8 SHA-256: 857e9c8c913cde9646978b24551d983ff8836a4a787ef06637ecbc6124b285b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, directing users to various PDF files hosted on disposable domains, with one URL explicitly mentioning 'blockbuster game apk download'. This suggests a phishing or social engineering attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alamansyria.com/userfiles/file/xulisuxezugetisa.pdf In PDF document text
    • https://atlantidegattico.it/file/19477744564.pdfIn PDF document text
    • http://gr-chem.com/upload/files/76048395674.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/pibafuzovu.pdfIn PDF document text
    • https://scalper.ir/data/files/file/34823901800.pdfIn PDF document text
    • http://th-hl.com///upload/files/nozuzojefosa.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/43796888608.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/16071199665.pdfIn PDF document text
    • http://winso.tw/userfiles/file/92748733625.pdfIn PDF document text
    • https://partetesal.ir/data/file/64761987166.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/73147722851.pdfIn PDF document text
    • https://rafautama.com/uploads/file/47746797347.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311f6d98f57---sezavapafupavegixiv.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/99005419140.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090402331573499.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/dafizopodoxebesi.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/45253957587.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/3172003207.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/denija.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/lidosanisibigaliwubanod.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/7453950001.pdfIn PDF document text
    • https://bauarch.bg/files/vugenimakimu.pdfIn PDF document text
    • https://actor-conseil.com/files/file/zaloguxadajasopisixibup.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/vubazibudori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=blockbuster+game+apk+downloadPDF 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_off0000c8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D7 11236 bytes
SHA-256: c7ea941ad6c2485af10324683fdb72a304fd68866c496209a1b427534658440c
font_01_sfnt_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 17128 bytes
SHA-256: bc2469dec1921710a7fb5e795ae0b3f1eae879f08b1063f539cdeb586c2d9a99
font_02_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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