Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d6c1cc4f30aca7…

MALICIOUS

PDF

72.3 KB Created: 2021-03-20 08:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5e6405937ceeee21496f499acd801afc SHA-1: 22ed38ded36e448f95a23e0cf6181e08928888d1 SHA-256: 73d6c1cc4f30aca7eafdc65cc2d14e6396b12e0f551219eb9515b865fef16695
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 0.9998

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://nipisod.ru/wix?keyword=ordean+middle+school+duluth PDF link annotation
    • https://cdn.sqhk.co/nulusezitelo/iPejsHM/29996314070.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/chaLp7U/pixel_petz_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/doxelatofon/amPW6Xq/45811614582.pdfIn PDF document text
    • https://cdn.sqhk.co/kowukogifaw/haqoUjg/40541604712.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/0fibUyC/drive_and_park_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/josedinis/Fegdgje/57375640943.pdfIn PDF document text
    • https://cdn.sqhk.co/lupananonutu/hiyjjUg/basha_movie_whatsapp_status_video.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/djg0rRz/ralikiv.pdfIn PDF document text
    • https://wakutoji.weebly.com/uploads/1/3/4/3/134314583/5b3236c.pdfIn PDF document text
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/6161492.pdfIn PDF document text
    • https://cdn.sqhk.co/vosiwuli/Wf7jeQQ/defence_application_process.pdfIn PDF document text
    • https://cdn.sqhk.co/mevutaxisut/hidghyK/fudizupufuzevex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0e9b28a0-3db4-42f1-9930-2719fb57c3b1/zondervan_compact_bible_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/48551742727.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/amazon_video_app_panasonic_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b214242-fdab-4554-8b7c-8d69950afdcd/nc_7th_grade_social_studies_released_test.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/dragon_age_inquisition_pc_cheat_engine.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/bethlehem_college_tauranga_uniform.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB5 5088 bytes
SHA-256: 163674f82e0b8db9f16fd8f1a49121831d3023dc4fdb58d911241ce013480a1e
font_01_sfnt_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 11048 bytes
SHA-256: 4f1c42e1814be60a27fa844430ec02279abfd4d336b9a3cf7aeabf692b0426aa
font_02_sfnt_off00010488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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