Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9844c445ded40cc…

MALICIOUS

PDF

75.9 KB Created: 2021-03-24 11:37:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 89ed977d70d52a586be616f6e685bc54 SHA-1: a7cbd1c00b9940bb4b6091ea072c2b86fed406ed SHA-256: c9844c445ded40ccecb46cfe9a96edebd2859028138686f03c53473d936f7322
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/wix?keyword=mark+klimek+notes PDF link annotation
    • http://rezltml.xyz/312559815895y5nb.pdfIn PDF document text
    • http://topplafond.xyz/eurydice_bologna_process_implementation_report2dsdb.pdfIn PDF document text
    • http://ejinaya.com/45607959378yfv6m.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/converter_wav_para_midi_onlinejtm7r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mokixetat/tales_of_a_fourth_grade_nothing_chapter_7_and_8.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/irving_berlin_blue_skies_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/bootloader_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/wijofaxax.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/english_to_amharic_translation_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5221673-c29e-4b20-b01a-a411f1a6193c/83248281815.pdfIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_4eb862902acd4f05b92505f91153c340.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovitiku/nutrition_information_bread_flour.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_23ddaddcb9de49a998f878812ce3ba0e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/doubleclick_reporting_api.pdfIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_00d90e51536e41c38a6780997c7d376d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/going_to_future_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c266f431-195a-4869-ab01-e08fdc72679f/24673783000.pdfIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_b55bd27a429842ca88a250cc7836bbcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/zowopelawupegibikuv.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/lagu_binks_sake_brook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32acfae-1bde-4fa7-929c-f7cf5cb6041e/susofejigozuke.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 4900 bytes
SHA-256: 608be33a1874b7d89746b884103e619746e6eae21a0a484190d474ff0b01e3d8
font_01_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 12168 bytes
SHA-256: 4fb62cce9b50434566fd84d16a7fdaebc4eabd64f9fd2229957909c3c40fab3d

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