Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba7d9778b49dab0…

MALICIOUS

PDF

77.9 KB Created: 2021-04-04 16:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9d53dd496797d6fe8b7a0848e34b71a7 SHA-1: 56aedea6300d0aea25737fbb1919fc33f29d465b SHA-256: 5ba7d9778b49dab09807dc99a211acdc34818a22541a7123d24cc3cd0396ccc5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/award?keyword=adwa+al+bayan+english+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384304/normal_60656ace70734.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500882/normal_5ff9a6a925b45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374682/normal_5fe5b8799e312.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385413/normal_5fff4c73a22e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530578/normal_6026569031eb6.pdfIn PDF document text
    • http://fusojosejivo.iblogger.org/saboxeduxoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374852/normal_5ffa4ff6527d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5fdf5404ee3f1.pdfIn PDF document text
    • http://datofifuvekone.22web.org/free_format_rpg_iv_jim_martin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368751/normal_5ff384f18eb7d.pdfIn PDF document text
    • http://tenipimutav.mywebcommunity.org/robert_anton_wilson_prometheus_rising_audiobook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446917/normal_602d346e29a1d.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/kung_fu_panda_2_movie_download_in_hindi_filmywap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_90e41bc2127a47b5a600e3a120225559.pdf?index=trueIn PDF document text
    • http://zevesijuduma.atwebpages.com/delirium_trilogy_book_4.pdfIn PDF document text
    • http://kupikobu.epizy.com/zefunerovomadewigaf.pdfIn PDF document text
    • http://gurelijefumodaw.epizy.com/deliravagofifefuj.pdfIn PDF document text
    • http://juvofirodeburu.epizy.com/diabetic_ketoacidosis.pdfIn PDF document text
    • http://wokarodefi.onlinewebshop.net/24754992108.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_93a50021d36d42748b754f06df8eb53f.pdf?index=trueIn PDF document text
    • http://sawelisibov.rf.gd/7_tipos_de_comunicacion_masiva_ejemplos.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_98d5456781dd441cbe32318ef4e9b726.pdf?index=trueIn PDF document text
    • http://vekamujibatebig.rf.gd/68747770165.pdfIn PDF document text
    • 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001094a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1094A 19664 bytes
SHA-256: 3413dcdbd373697f3f36a0cce2cb22b7ebbb9cfdaf494c64a908e6db9b1eb435
font_00_sfnt_off0000cf4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4D 5528 bytes
SHA-256: 2f20ec713ac7d1a9871228408f111afb130418764e4f56f32989520b9598d260
font_01_sfnt_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 12224 bytes
SHA-256: e7633ff2d6712144c81410e0bb9555621bb94a6c3f42f686de5afab7a463708b

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