Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac408fea98ebfb33…

MALICIOUS

PDF

69.0 KB Created: 2021-09-16 20:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a9235463cff97b202d1b2759b60cd533 SHA-1: 54e72ac417074013384b4dcab96453a2c1ccf497 SHA-256: ac408fea98ebfb3353c123b4c6785d8bedc344550a258634a1ed8203f29c55db
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a malicious screenshot lure, designed to trick users into interacting with embedded links. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, supporting the phishing or payload delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 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://rosebankprimary.co.za/inc/ckfinder/userfiles/files/70393054677.pdf In PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/mesepeto.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/87301805626.pdfIn PDF document text
    • http://clickvay.com/upload/files/37720316701.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/13003787901.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/77188857721.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/jutulaxiti.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/tetoxogasizepijewibasaboz.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/77457026054.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/golefow.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/37480380587.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/63811435886.pdfIn PDF document text
    • https://emenu.hu/editor_up/torodojanokemulilarek.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/vadiloba.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/27883373248.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/sawebelesumefakob.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85e29742e---80887958232.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/2435821378.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/debakisumekotobabuxeri.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210903_58D8DA55ED011EC8.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/3594681597.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613861ea0ace5---jefiwutamidoxiwewigafi.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/36948923957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=acid+and+base+properties+of+amino+acidsPDF 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_off0000b202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB202 14232 bytes
SHA-256: 709e010550203c77689301d35eeaa19b4879c52f8ec4586412f212871621e21e
font_01_sfnt_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 10856 bytes
SHA-256: 39ad343450de26b63e535e348fad6ee639f022895b44ea317053a6288e9c76f7
font_02_sfnt_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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