Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6ad8e5ab851143…

MALICIOUS

PDF

90.9 KB Created: 2021-01-16 12:30:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8af90bb59d2e588f8cd909113af8d438 SHA-1: 72e8f911cb6b5be37034fd8eaa15fb633bb6c875 SHA-256: 3b6ad8e5ab8511439868bf218f3863f4c1b2395749670217487a17ceb0460cb1
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong intent to direct users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious nature of this PDF, classifying it as phishing and a trojan.

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://gettraff.ru/123?utm_term=softball+rule+book In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_5fa914742c1be.pdfIn PDF document text
    • https://gazuxupoje.weebly.com/uploads/1/3/4/1/134108966/40489181058cda8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419437/normal_5f9e4e5f6c6b6.pdfIn PDF document text
    • https://rabinuzigiv.weebly.com/uploads/1/3/4/7/134737829/sixugubavi-xabopizori-puleji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5ff6144e7eb6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465012/normal_5fd33c3ae6150.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/guvararuxo_dudiwuwavugog_modugejal_lebudeliwoxaz.pdfIn PDF document text
    • https://sitawixabebel.weebly.com/uploads/1/3/4/3/134319036/tawetukidajo_nowibapunilaw_powikajigon.pdfIn PDF document text
    • https://site-1202168.mozfiles.com/files/1202168/the_truth_beneath_full_movie.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://s3.amazonaws.com/felasorarabipis/systematic_random_sampling.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/fade_into_darkness_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/furoma_rift_guide_mousehunt.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/sql_injection_test_form.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 4616 bytes
SHA-256: f1377dd37a79bfe01cdaea748cacdb0e8a48c66679e2539e9fad06517e5a511d
font_01_sfnt_off000114b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B2 11260 bytes
SHA-256: b056afbaab9d18f7a7dba6b28bf069347e110b5ef513a34fccae358d15779af2
font_02_sfnt_off00013b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B39 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61
font_03_sfnt_off00015035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15035 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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