Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc76a2eed8986236…

MALICIOUS

PDF

62.4 KB Created: 2020-11-25 22:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3ba9b44b3e27477b98f30771adf74006 SHA-1: 4c4deb6717230ca86e6b00175007cf15b04c3c5d SHA-256: cc76a2eed89862368d7d86de4c0f1c2ad53c6f60a01baf18698ce52eddf6fd03
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 0.9994

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://trafficel.ru/strik?utm_term=songs+in+e+minor PDF link annotation
    • https://nujelojebalu.weebly.com/uploads/1/3/4/6/134690198/1289367.pdfIn PDF document text
    • https://savakorudefipe.weebly.com/uploads/1/3/2/3/132303238/sinazebodesobol-vumaraxomeluji-wufun-dizumuge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc62400-1206-4602-ac2c-77dd8ad1ce95/noxomijanenalipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690a4609-1fc6-4024-b1d6-9754638b593e/gonid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ff5814-591b-44c4-847b-a225abf27e47/minecraft_skins_skindex_editor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8c4723-893b-437d-b12d-2d30994ddfa1/ladewolisuvozaduxu.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/chapter_9_physics_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8771e068-30da-4da6-9f47-1eeadcf2de98/ranger_s_apprentice_weebly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad3ebef0-ddf1-48b1-ab66-7dd6ed794dee/zojotemozowuxobedirelok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbda2675-dd97-4e01-8153-609940a48a01/49962790838.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/dear_in_spanish_formal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d853479-dce3-41f6-bd05-a05ea35e471b/vigonigutulotuwe.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0D 4868 bytes
SHA-256: 3ac0f4afc4b7894a16153c2f12e954bec3cb8b8af2c496158a882d6d937405bd
font_01_sfnt_off0000bf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF82 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0000cae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE5 9888 bytes
SHA-256: 6090eacc4dd7b7625582999204d5a8271433bfd5ab6f2fdfbba620235d6ac10c

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