Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fd9acf28f43cf5…

MALICIOUS

PDF

77.2 KB Created: 2021-02-17 22:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: cf05c2df75fe1a699f36be7005ca5420 SHA-1: 1944263f7209ba07577308473d392f9f3e38c981 SHA-256: c6fd9acf28f43cf531efd985e66d3b70834dfe5f5811891c271596ed752f9d4b
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external websites, indicating a link farm or phishing attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged the file as malicious, supporting a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/strik?utm_term=what+causes+water+to+leak+from+washing+machine In PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/3655682.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/ygci3XS/star_wars_kotor_pl_android_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/ifheihc/tupinunipenokon.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/jijdibi/sufuwiwulutoko.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/jdicSjc/70359167026.pdfIn PDF document text
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/541705.pdfIn PDF document text
    • https://cdn.sqhk.co/zatugudaxaji/qgdtPie/nanidokimatarelarisobi.pdfIn PDF document text
    • https://cdn.sqhk.co/rotelizedo/jhxjchh/sabotos.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/ifOAzhi/how_to_download_xfinity_stream_beta_on_firestick.pdfIn PDF document text
    • https://begakidiwadagav.weebly.com/uploads/1/3/1/3/131397934/zobowuzarexamef.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/gujutavevive/47961009189.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/zarasegagutawif.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/75917663564.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/lamur.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/cydia_app_store_apps_free.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/gituzidi.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/movenunigufab.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/logo_quiz_level_18_all_answers.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_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 5464 bytes
SHA-256: f25b529e81cecd26a0924ec3c1aa5441c6c624c44e871845ef4275bb002d6795
font_01_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 10400 bytes
SHA-256: b7d8c4abef5b453fc2c34ab9b4ac9aa2a2241aa581543868b634b539fcc555a5
font_02_sfnt_off00011235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11235 16148 bytes
SHA-256: 64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b

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