Malicious PDF — malware analysis report

Static analysis result for SHA-256 8871bb3299539dad…

MALICIOUS

PDF

83.2 KB Created: 2021-03-31 10:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aa9c1316d10666651bbed8e23d0077d3 SHA-1: 56a72a399ca02ae95c91500b622999186a168afb SHA-256: 8871bb3299539dad8e6911eea2a82004c956c716bde236baaaa1582e3d4c2a92
186 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 0.9997

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.
  • 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://soxebez.ru/strik?utm_term=why+is+my+keurig+flashing+red PDF link annotation
    • http://vozuzutiwajuzip.getenjoyment.net/91668177048.pdfIn PDF document text
    • https://metogixum.weebly.com/uploads/1/3/0/7/130775033/9e008.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/higgiic/werewolf_online_cheat_codes.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/gedajewupetezetakogaluzo.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/cwxjiXH/redcon1_mre_flavor_review.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/jbzQ2gc/break_the_wall_game_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/geCgjge/14052568624.pdfIn PDF document text
    • https://cdn.sqhk.co/nopavoboriru/6ji3Ehj/run_sackboy_run_tips_and_tricks.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/qyLBjhk/mewaruxitojowemifawixoki.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/ejbiiib/26590771165.pdfIn PDF document text
    • https://gilawidukawopux.weebly.com/uploads/1/3/2/7/132741225/ca73ae.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/hhFgcs7/61520909143.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fonunegemo.epizy.com/kojitofelopinokikorara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/889f2e15-4924-4120-8c91-693baabeffed/luwalupimolazexubin.pdfIn PDF document text
    • http://fuxurekosorozu.rf.gd/spanish_books_for_beginners_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3534396-1290-447c-b414-49107c0d8a51/how_to_balance_chemical_equations_using_algebraic_method.pdfIn PDF document text
    • http://senotujupube.epizy.com/codigo_chamada_de_emergencia_android.pdfIn PDF document text
    • http://lesiterifok.epizy.com/proxy_browser_apk_free.pdfIn PDF document text
    • http://wufikemofumop.atwebpages.com/program_management_tools_excel.pdfIn PDF document text
    • http://ligiwekuxote.myartsonline.com/foxipe.pdfIn PDF document text
    • http://vudemiziwifimo.epizy.com/resetozinoxu.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_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 5500 bytes
SHA-256: 44f35ac66eb970247654824ba61ca48c4d65cf8f9da1971e04c703c0a4515dfc
font_01_sfnt_off00011b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 10756 bytes
SHA-256: a18ee586fdd74e623c4193ca05a60977ca479df32fce9e6937df3c59455558b7

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