Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af65215b0e419f0…

MALICIOUS

PDF

81.0 KB Created: 2021-04-03 04:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3ee83b437986b70eac1034a204190cba SHA-1: dbbac15c20ad732f9abd79d851ead5d63b46f5a2 SHA-256: 5af65215b0e419f0287f00fa6f22dbc079bd16d6f741cde4dae3db76b861c856
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. This indicates a link farm designed to direct users to potentially malicious content or phishing sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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://dafemum.ru/wix?keyword=beatnik+slang+for+got+it In PDF document text
    • https://cdn.sqhk.co/xipapotug/ihjhidG/lomadulinujivopum.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/8VhiHdI/kigezevobimejawigira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447906/normal_605827379319d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387567/normal_600d6f2b68f9f.pdfIn PDF document text
    • https://cdn.sqhk.co/gajerivab/XhgUIFy/bekisuwifizamofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_602456deb2cb7.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/icMNjav/peter_rabbit_birthday_party_decorations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_60207dbe096e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503584/normal_5fd99a684bd22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_6036d10fe39b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367938/normal_5ff1bec996caa.pdfIn PDF document text
    • https://cdn.sqhk.co/vijasezadida/hfLjfPw/free_background_music_for_videos_soundcloud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410418/normal_6019b5ddb525a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://316b94d8-f1eb-4552-9621-e6dada6029ed.filesusr.com/ugd/4b675a_9fd9f02a76a74d1fbe376a86b36856bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be00031-3807-427b-bdf4-fa631ca4311b/devovi.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/7_wonders_of_the_world_pictures.pdfIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_e67174a6d857421698327e75b0149ebb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce3c8a7-60e0-4498-9236-2b76299e36f3/82824310789.pdfIn PDF document text
    • https://fc59733d-949e-4df9-817b-fea2515c5cc7.filesusr.com/ugd/689329_fb80c39fca6548a4815bee8c9e93f53d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ab17263-07a6-45a6-9547-59714c0569fb/butabifigaken.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/federal_rules_of_civil_procedure_2015_amendment.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_off0000fe6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6E 5048 bytes
SHA-256: fe0b5a3df82518613a50e15d182803d79b733a32758eefb44311362c779fd627
font_01_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 11108 bytes
SHA-256: 4a316e4038b73970f21d1bf8f8913f330a5d2eb07ee20a8ec11b11620a5e1391