Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7965dfd7b9af82…

MALICIOUS

PDF

79.1 KB Created: 2021-09-09 17:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bf71df962f8317d40dc24543889fee2e SHA-1: 900537f9104e5403c21efde19ab8af38776d2530 SHA-256: de7965dfd7b9af82b94c21744e62e379383dceefe01828c214e4873d869029f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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.
  • 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://hrt-foto.hu/_user/file/88498605536.pdf In PDF document text
    • https://qian-ho.com/upfiles/editor/files/puxekivozofadagamu.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/77089500630.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132eb8247e31---14461630931.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/86435759858.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/xubalalatodik.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/61425910562.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/5813640444.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/42rr3dq1194fnsrdlugevcf7vg/20797722714.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/xekoxefejuvudunoronoma.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/11543620005.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/tuzaditalanakufefeg.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/80727404354.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/162298541461332c55cb511.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/liruzerirurira.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/10504948982.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/36289332588.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/13188563502.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/58960176405.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/fefalepitofe.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/62477408093.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/burokomudawulox.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/geluduginedituzo.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/mulobopeg.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/kajuranipekunopegazebisej.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/totipukivixajaledomew.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/15722466594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=after+we+collided+full+movie+124moviesPDF 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_off0000cc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC29 18856 bytes
SHA-256: 070fcc9ee2bff6555f4a2f1f5f9ec08ae06c5c7523dd9723ab67328eaaff6f0a
font_01_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 10856 bytes
SHA-256: c5cc71e92f0a5c59b56c9b2f2d8f99f3c14432f676a9b4c45d9c35f0893de795
font_02_sfnt_off00011685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1