Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f6508424990d46…

MALICIOUS

PDF

67.8 KB Created: 2021-09-26 17:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 574aabd2ba246ed460309c00a09b010f SHA-1: 91faa23d3797727fef4afa85cc0c1ca24414c10e SHA-256: 15f6508424990d464e567e9dfed7201cfe9dd39b9b39ffd8590a721c5bf30d25
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many of which point to disposable domains, suggesting an attempt to redirect users to malicious content or exploit kits. The PDF structure itself is minimal, with a high image-to-text ratio, reinforcing the lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 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 http://twozonechickenlasvegas.com/uploads/files/pevazuvinujojamosozo.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/5002596600.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/61047752203.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/mapulika.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/tilixeredit.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/26361728384.pdfIn PDF document text
    • http://biggedefense.com/userfiles/file/70272191282.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/23704089283.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a2993c2f1---23772281838.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/86254003816.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/vadetunirawoxovojujapuzu.pdfIn PDF document text
    • https://airshow-bg.com/file/11980745083.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/13146151262.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/tevunajatonomumeje.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/88681611858.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/loxenusenulojizif.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/16251194687.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/32334151100.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/58138786369.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/8799818523.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/37301618135.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/jawewobuxegojer.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/58004057581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+use+old+android+phonePDF 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_off0000ad85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD85 14356 bytes
SHA-256: ea833871c2b797b34eca4055185256987f31c9e2dd384473ec08fcdd4158df61
font_01_sfnt_off0000d14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 10664 bytes
SHA-256: af85acec52315ff7e3feef15fe2730a7c9be52725bac575d5ebebc14c7ea9d50

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