Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed887d567543025…

MALICIOUS

PDF

72.8 KB Created: 2021-09-12 07:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 769f81929fa42de1218692b34d2c7281 SHA-1: 2e7daa8869eb6c4facf661e46f01aaeb74101a70 SHA-256: fed887d5675430256e44549a86e8f49622c7d8e0671a9183000bccf3cf8dec9f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript (T1059.007) is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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://ijp2.com/contents/files/15280967167.pdf In PDF document text
    • http://abwlargo.com/uploads/files/97254075719.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/xagakuzabuda.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/52476661899.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/69151127553.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/magoxizezojafad.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/kodigurexerodo.pdfIn PDF document text
    • http://rem-proekt.com/f/file/73396352879.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/jazumutodepegodozax.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/17513225281.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/5870909158.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/4140995731.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/vemedi.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/podexu.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/31202706028.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf71b742e9---87464472765.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/12884159611.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/71983877801.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/64250985582.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/85567977004.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/25363118655.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/vesenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=amazon+fire+tv+vs+mi+boxPDF 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_off0000bc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC15 10676 bytes
SHA-256: 58f125d748af9aee2dd2461bab6d633174cb6eff9a1988a81cf835bd536fedf4
font_01_sfnt_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 16076 bytes
SHA-256: 2b3d5378ea8dd567f494339a64c00d51558e1c67c7f2131330113d604da379bd

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