Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4186bf652d015e4…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 14:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8c56270d6b744a557a44cb1fc566111c SHA-1: 8eabf121a273473aa956f4a29eaa22e1f7218cd5 SHA-256: e4186bf652d015e478100cb2379bde7bdfe8a703d9d6bceafa10e9ee5b63edc3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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 http://hk-keber.de/images/file/vavizevare.pdf In PDF document text
    • https://kingdom.vn/userfiles/file/25492631900.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/38794511877.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/38308295338.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/789024ac6f02cfaad270295c52e20809/zowufoniku.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/75454435123.pdfIn PDF document text
    • https://fishboat.hr/files/73221301372.pdfIn PDF document text
    • http://cocoal.com/uploads/file/73426246269.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/96287545598.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/95454232713.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/44489847695.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/molavanufudosuzekaze.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/77171292400.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/73928604541.pdfIn PDF document text
    • https://verner.lt/images/files/podiwaxigalubogowazokek.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/wunogunexanubefo.pdfIn PDF document text
    • http://birdwatching.sk/media/file/mevivedixutixogutu.pdfIn PDF document text
    • http://wixoon.hu/upload/file/11068645374.pdfIn PDF document text
    • https://capecoralliving.com/media/file/52274166625.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/72183994023.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/zilurimowexal.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/bevosuximesoxikepij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=x+box+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_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 18108 bytes
SHA-256: eebbf04a1a89e7b2fedc4607ddd44aebda85673c2ccbfbdfe3619499491fedd8
font_01_sfnt_off00010260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 10220 bytes
SHA-256: dffd7b424d5b8f40238d5c01f8f5b046eac0ab86ba91fc7d1438aeec21d643b9

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