Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a21804ee647b568…

MALICIOUS

PDF

74.4 KB Created: 2021-02-22 19:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bb5aa7da7ee98a18e4b1abc59217d611 SHA-1: 8eacbf1218685ea53fac6d730a166c4618d94eb2 SHA-256: 9a21804ee647b568f90534e098bea3e1f767221aa10e6b5a97ecdb8a862bdde2
214 Risk Score

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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=clasificacion+de+funciones+lineales In PDF document text
    • https://cdn.sqhk.co/bizewavaxug/jdFjadi/96536220080.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/PsjgjeL/mapuzebosorugibazu.pdfIn PDF document text
    • https://pegogelixuj.weebly.com/uploads/1/3/0/8/130813965/48f4637.pdfIn PDF document text
    • https://zoxamadafipezo.weebly.com/uploads/1/3/1/1/131164297/0183cedc.pdfIn PDF document text
    • https://nabisomo.weebly.com/uploads/1/3/5/9/135993280/4486596b2cdc5a.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/dhihje9/wechat_pay_vs_alipay.pdfIn PDF document text
    • https://sivikowililip.weebly.com/uploads/1/3/4/5/134599649/lapovikopa.pdfIn PDF document text
    • https://zogazipo.weebly.com/uploads/1/3/2/3/132303407/6620740.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/kotodur/nhl_collective_bargaining_agreement.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/towogadeziwatakigidoletux.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/faxetuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/bejeweled_2_online_free_game_no.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/605968888.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/rumipomezinu.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/cadbury_silk_song.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/64232909115.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/ampasayya_novel.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/hd_screen_recorder.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8B 4824 bytes
SHA-256: 0df37362a4a53da7bcaf0a605c1ec526a7a4a334302660c9d24e84289661bddf
font_01_sfnt_off0000df04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF04 11652 bytes
SHA-256: 915f6ff010b7dfde68e519c06b37403444674ff8ed9865f714086ace32171213
font_02_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 16088 bytes
SHA-256: e501227967ea6808d5c8f9227811d5f26b5f14dead8455f174ebe8e756a58eea

Open this report in the interactive analyzer, or submit your own file for analysis.