Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5495b8e6d919a29…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 08:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c9804ac3f8f3f0042c8edf36440f4b4 SHA-1: a552f2c4b142deadad8dd0ae67852e1f28a5f716 SHA-256: c5495b8e6d919a29b5afa09e1444d80cae792afa254785c27af88f5ac99c7c65
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and is structured as an image-only document designed to trick users into clicking through to download further malicious content. The presence of numerous external URIs, many pointing to disposable domains, further supports its role in a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 70 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://martonelektro.hu/files/file/32140744466.pdf In PDF document text
    • https://roarmysecurity.ro/mm/file/43149082635.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/64654166077.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/jewirijexasew.pdfIn PDF document text
    • https://panama4d.com/contents/files/minenepixikajavefurov.pdfIn PDF document text
    • http://citty.org/images/uploads/file/gagelu.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/putiwotelozamilaxeko.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/jebibuna.pdfIn PDF document text
    • http://miminku4.com/contents/files/56709338898.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161488b6d8ffdd---51531919355.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/26354656162.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/62586172438.pdfIn PDF document text
    • http://www.polni.si/Images/files/doxemamuvuwiboduturivasoz.pdfIn PDF document text
    • http://abworder.com/uploads/files/jutibepizanoda.pdfIn PDF document text
    • http://unsersohn.com/images/file/jejovuzofizisa.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/xotawelo.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/xagekofugodowetixefefepif.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f392991f76---kuzojilalubato.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/jatotanaxiwasoperud.pdfIn PDF document text
    • https://rajakedua.com/contents/files/30524929849.pdfIn PDF document text
    • https://kawanmto.net/contents/files/47760082714.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/lomivejobogitizabaxuzusil.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/letaxezegewaxisugikug.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/81045185743.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/45193044806.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/74676012011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+did+george+washington+do+that+was+importantPDF 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_off0000b3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BD 15028 bytes
SHA-256: f4bda27dd9499a2a6e9989044a7aab88506df3319876eadb9ec1b4b18bc3a201
font_01_sfnt_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 10872 bytes
SHA-256: 2dbe1e570be99b0430933199d79643e5b0f47d387577ca7093aa5dddfc969fe2