Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e270b087e08c88…

MALICIOUS

PDF

80.7 KB Created: 2021-10-08 03:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2ce410d6e1b06d5d70045d49b3a8fe75 SHA-1: 761ab61509e1a99ab5a54cf0bdf2781fe50bb1a7 SHA-256: d7e270b087e08c884400ee9ed6360b9ea7c653d669be9f1b1e506e4938b45626
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as a Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. The document body is heavily obfuscated, but the presence of embedded URLs and the link farm heuristic suggest the primary goal is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://yuli-china.ru/d/files/53820596480.pdf In PDF document text
    • http://tradotel-riviera.com/file/dajobiw.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/kugokokejazutexafukatubu.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/kiwejijetufekomedisosomu.pdfIn PDF document text
    • http://tlcjty.cn/userfiles/aa/file///desaxonijojomunim.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/29068926370.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/guretawatoretepesoj.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/bezuxo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/63s7u3ujiohiivlhsciuubhoo1/wubasugopamejuwiwufafi.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/42079815894.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/60190264734.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/16747031010.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/kawadinisef.pdfIn PDF document text
    • http://abwva.com/uploads/files/keminewowas.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/moxagol.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/83002364538.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/61401583918.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/gepaberoloxobobim.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/4805880484.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/72918594480.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/pedagowekezoxegoxebebuzov.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/28652311425.pdfIn PDF document text
    • http://fxlcd.com/upload/file/7377505653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=willow+and+ginkgo+poem+pdfPDF 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_off0000d428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD428 10648 bytes
SHA-256: 6837650c58b060346e4cf61bcf1cc98d0606bdfa5468f109cec8b3f6506fe03d
font_01_sfnt_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 18944 bytes
SHA-256: d45104650fec6ecd4b9b33a12d0158a7af758e6513634e713de438bb95d8f8bb

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