Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2f7c622a533475…

MALICIOUS

PDF

79.8 KB Created: 2021-09-23 22:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b623233b2c034cef12d19ad3ecd1654d SHA-1: 1b8c1a8e42fd3086b66238db61928508847ad719 SHA-256: 8f2f7c622a533475403c50bcd48adc2ce5fe71bcdde28b7269986b0673ca98b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the structure points towards a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://linardi.ru/files/file/66395760701.pdf In PDF document text
    • http://asja-doll.ru/userfiles/file/soropodewemoxepaj.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/c0fe37331a2bf3ddfd084154357d2ba3/zimuzasavomovapo.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109022011456385.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://clubmaniacr.com/campannas/file/78482601436.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/zagikoripidofisuxebinife.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907050350819074.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/nefutabuvulagavel.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/metogamosonena.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210914_150544_110.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48335623081.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/soxape.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109181524272307.pdfIn PDF document text
    • https://akemi.ro/hirek/file/45447073995.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/zanirunirosuvokun.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/31673632043.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613880868c4f7---kafabimali.pdfIn PDF document text
    • https://cakkue.com/contents/files/81126930209.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/rapilabulisetekisolovuli.pdfIn PDF document text
    • http://synhbio.com/upload/files/48134266304.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/97292757460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+more+diamonds+in+episodePDF 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_off0000d2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 17644 bytes
SHA-256: da666bea01661ef69b46241abbd1069caf4bd0fb3e23ca76e7b829fdd3573bae
font_02_sfnt_off000118ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BA 10768 bytes
SHA-256: d9a6e71b9532e27aeef2631bb9f83424e772530ccfe885d2b9e73200a2e36e70

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