Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3086b0cb261e5f…

MALICIOUS

PDF

80.1 KB Created: 2021-03-22 12:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5105ae9e1890737e272146ea103eb8dd SHA-1: 5a9ce443b5454d0b5df53a17f67fe0e91f3c093c SHA-256: ea3086b0cb261e5fb6312034077ad0e26ab6398325e0705a53bb8c30d32bbbb6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/strik?utm_term=how+to+calibrate+cobra+29+lx+max PDF link annotation
    • http://nashremont.site/sawuxumukukumeruwedeto0u46b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_6011d7af2afa2.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/gYghIhj/voice_recorder_free_mp3.pdfIn PDF document text
    • http://trynon.xyz/1423725315748kp1.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/Mhjggge/msn_text_twist_free_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_6037797585b92.pdfIn PDF document text
    • http://idealica-uficiale.website/mini_stroke_signsji9e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480756/normal_5fcecf815666c.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/zjdvjsD/gyro_buster_mod_apk_download_for_android.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/how_to_replace_samsung_refrigerator_door_sealclq19.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/vinejivunitego/bzu_ba_bsc_date_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/49115455694.pdfIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_7ad29e1952534c9dbd8117105016ff5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalomi/womafosotu.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/big_ideas_math_7th_grade_online_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/jijajenubiwigo.pdfIn PDF document text
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_74ec2eb268634f88962a82d947f7ea4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/how_to_play_camcorder_tapes_on_tv.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_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 5316 bytes
SHA-256: 26a2aa9baa4304e7e863ec809ae33fb24d01d5ef66e7b701f815718b62143625
font_01_sfnt_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 11212 bytes
SHA-256: ff77908b325f1524f94d04ef17e8af6960dbc374128df3c563fc539eb0a4ed19

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