Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f9b08438eda4d7…

MALICIOUS

PDF

73.8 KB Created: 2021-09-10 23:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 76bcbbf982ae0c7f26d4cf42317af388 SHA-1: b769b5d51a5140181186822b6d56b679541061ce SHA-256: f7f9b08438eda4d7387287987994cb983211c0905a7172b424c71a73ed6a03b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, with a critical heuristic indicating a PDF phishing trojan. Embedded JavaScript and numerous external URLs, many pointing to PDF files on potentially disposable domains, suggest an attempt to lure the user into downloading further malicious content or to phish for credentials. The presence of embedded JavaScript (T1059.007) strongly indicates an intent to execute code within the PDF viewer, likely to facilitate the delivery of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 https://advance-pack.com/editor_upload/file/52410707902.pdf In PDF document text
    • http://air-separation-supplier.com/d/files/pepitave.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/75031670773.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/n5kstv0dic38nhm1oq22cb3vq2/6274310159.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/fedibefo.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/42900390091.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/buzupudeso.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/79803029981.pdfIn PDF document text
    • http://glttek.com/userfiles/file/ziwemisibo.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/636969c89d3226d82f2c8ba2cb14f72e/31935827820.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/97715012075.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/31128866093.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/98458442738.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/rakawelugemepufulasox.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/rejabuladire.pdfIn PDF document text
    • http://scarpatti.com/files/9054619973.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/89271208113.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/fifawugufixudupew.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/85968938106.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/bosarimotefexotutuvos.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/rakofuvitajew.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/47728260100.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/wafizativovukebubekeb.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/49160566901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=galaxy+note+10+vs+iphone+11+pro+maxPDF 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_off0000bb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB55 17108 bytes
SHA-256: 24d49f903bfc39ec3427c0bf9fa81075a3eed3b8ef7db7a4000bba93a68bb224
font_01_sfnt_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 11012 bytes
SHA-256: 7f5edf6d4a407b103ab25528a42809d8b562dcaae6c0a01c3a5df245579e4496