Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97cd2e964fe2edb…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 18:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e87b97c644de7267b99fe30a09ff139 SHA-1: 39d2f9b4098ecefe16a9a0c3bf26d46c8f70778f SHA-256: f97cd2e964fe2edb31fdc4e2e8c34a7865fad7a8a0ec0b4dc177a57901de72a5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URIs, many of which point to disposable domains hosting other PDF files. This behavior is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious verdict, suggesting the PDF is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bursac.net/userfiles/file/xokikogiguxubetetopubom.pdf In PDF document text
    • http://thebankcardservice.com/uploads/files/93812745571.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/29021933657.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/8737006212.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/xurugakinanegavo.pdfIn PDF document text
    • http://gtshotel.it/images/file/kaxawejirimavutafumi.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210909_110409.pdfPDF link annotation
    • http://ecofincas.net/ckfinder/userfiles/files/tadiborijevunatagufebo.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/6344452590.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/fukuxaxotimet.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091108192533.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/dutinigebunorugakaze.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/52710658019.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210905_102334.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/sibupaxetupurigogejif.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/soxiva.pdfIn PDF document text
    • http://groupkaishan.com/d/files/58227934185.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/19055248017.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/57212395273.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/kodovoluzupojaduzimigo.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/22716459821.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/74744286154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=total+conquest+apk+offlinePDF 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_off0000b27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8F 17688 bytes
SHA-256: 413356e2e548aad1e580701a6be5d4961221c7b163569a0469e60bdef4775784
font_02_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 10672 bytes
SHA-256: 39b9d5e69a20383ce0fb6325ff01de140ac7af2234d06a25737c1dc9a355a6ff