Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3dd995d76fc9ab…

MALICIOUS

PDF

105.6 KB Created: 2021-06-06 11:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7cca971835159df4590a9e452856589c SHA-1: e5f2343b6b5a3dd86f9482fd4f247d3980b4e8a6 SHA-256: 9f3dd995d76fc9ab9fec884ccb1e78616aebe6ec079561bc99ca3aa93a018917
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting or domains associated with link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the structure of the PDF suggest it's designed to lure users into clicking through to malicious content.

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
  • 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://crysiq.ru/pbw?utm_term=first+aid+2018+changes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475995/normal_6066c54b7f8b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426277/normal_5ff38cf6de074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448323/normal_600a53f29f77d.pdfIn PDF document text
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/wutiw.pdfIn PDF document text
    • https://mozufutedubido.weebly.com/uploads/1/3/4/5/134503110/birogibumetawusuket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493569/normal_60538817eeb8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477137/normal_5fe3a81de1ac2.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4493589/normal_60b4df2619507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_6048280b3f5ce.pdfIn PDF document text
    • https://zulozuger.weebly.com/uploads/1/3/5/3/135310252/beliripajevogegexin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452171/normal_6065776dd8124.pdfIn PDF document text
    • https://julotovodirol.weebly.com/uploads/1/3/4/5/134522883/nepilodi-dadupoge.pdfIn PDF document text
    • https://wadodimimilupe.weebly.com/uploads/1/3/0/8/130873890/58d9bffcd612a.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/fe15f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144413517/to_kill_a_mockingbird_vocabulary_chapter_24-25.pdfIn PDF document text
    • http://xegosigex.pbworks.com/w/file/fetch/144686172/82544530512.pdfIn PDF document text
    • http://vazesuna.pbworks.com/f/gapekumokofuluzo.pdfIn PDF document text
    • http://pagorevet.pbworks.com/f/download_easy_frp_bypass_apk_free_android_host.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/f/what_is_a_autosomal_pedigree_chart.pdfIn PDF document text
    • http://lonazetubuz.pbworks.com/w/file/fetch/144674070/93091744714.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_off0001489a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489A 5860 bytes
SHA-256: a4cb20f50442750ec2f8f3855e75d3e4aecbae8b9958b57f6ca770cc9d9bc48b
font_01_sfnt_off00015c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C92 11564 bytes
SHA-256: e4aab1bf381e4c274ff584f041fe2087928fd269bb79da91ad6958cecd06e948
font_02_sfnt_off00018421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18421 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7