Malicious PDF — malware analysis report

Static analysis result for SHA-256 432c1fd0728c14ee…

MALICIOUS

PDF

79.3 KB Created: 2021-04-03 15:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8a524240e9b3257a1eee6def10a27e86 SHA-1: 515fe9ab3c245e8ff0dfcd4cb2de86b6a6f7181f SHA-256: 432c1fd0728c14ee86e066a93da11ac8528cd742e738d2c47cb006a6d4c4b7e3
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 0.9996

Heuristics 5

  • 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.
  • 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://ponafet.ru/wix?keyword=physics+displacement+vs+distance+worksheet PDF link annotation
    • http://xobokalute.iblogger.org/55032532854.pdfIn PDF document text
    • https://roralolew.weebly.com/uploads/1/3/0/7/130775143/4895462.pdfIn PDF document text
    • http://xizabif.22web.org/49049691158.pdfIn PDF document text
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/98251.pdfIn PDF document text
    • https://juboxunogaruf.weebly.com/uploads/1/3/4/7/134700559/8603349.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/xufujofaleki/wordpress_tutorial_video.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/aaa_android_games_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/18015548266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ee8288-a02d-41ca-892b-9289de09028c/tecknet_keyboard_not_connecting.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/fair_housing_act_of_1988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca91f33-f3de-497f-9fb8-c9bd91103a78/murray_select_riding_lawn_mower_belt_diagram.pdfIn PDF document text
    • http://ruvukawuturox.rf.gd/13467186701.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/zuvovukewodotorupifikami.pdfIn PDF document text
    • http://rajiwewovipu.epizy.com/kazumaxuneru.pdfIn PDF document text
    • http://podisibasozo.rf.gd/dabazoduveneniwobuwofuk.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/amharic_bible_study_guide.pdfIn PDF document text
    • http://nisajemisekim.rf.gd/netgear_dgnd3700_custom_firmware.pdfIn PDF document text
    • http://pidukuniwid.epizy.com/bewolujadikojakulomonugar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa6bba7a-4795-4f8f-9c04-fd974b2bd73f/how_to_make_garlic_and_herb_dip_dominos.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/bixigejibemupiwilosipuweb.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/bollywood_movie_songs_free.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_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 5632 bytes
SHA-256: 06101b1662e0c3fded9965b7579a1d02178d25f3e854467b76bfd7617a087de5
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 10688 bytes
SHA-256: 1e0a640ac2e21dac836f09f19fc797af820a68ea19ae8aef9b61382bd42e1b6d

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