Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d66636889bdc8af…

MALICIOUS

PDF

92.9 KB Created: 2021-04-11 00:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 131f2b5bc233e4501e7d6b42adb0f0df SHA-1: 3737ba78bc7790f18d5bf6f1caf20158420dc0d8 SHA-256: 6d66636889bdc8afff519c9bd8aa5deaece197939c0a99c9200590362c46dbb2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment, likely leading to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://kuzutuzo.ru/strik?utm_term=about+roland+barthes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489994/normal_6026786747116.pdfIn PDF document text
    • https://cdn.sqhk.co/nepozenilu/jb1ghib/14561635041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462980/normal_60240b2697df9.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/h0ggUha/watavomulexajuboralos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487663/normal_6051449013ac4.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/jofnScl/vatorotuxekufapupuzefa.pdfIn PDF document text
    • https://cdn.sqhk.co/desixurate/jjGicuR/giruxidopotabovewibek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377403/normal_5fe3e34772e3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_6055078acbea2.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/1xijhal/the_galaxy_survivor_free_download_uptodown.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://23fe9111-5aa3-4288-b7a4-a84c242bb647.filesusr.com/ugd/d35b85_985f9dcfa9bc45f39130e0646af06abf.pdf?index=trueIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_96aefad127dc490b9543d3306f20c5e0.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_f0526cb3d7bb466cb8cefb1d0feab915.pdf?index=trueIn PDF document text
    • https://178fd8f3-986e-459b-a431-83c1f58eadb8.filesusr.com/ugd/7a8e82_180138f75cfe449997e31df4e96b4ac9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa806e7a-63c8-4f57-ae97-94cc5bd07955/31981010647.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_73e197bf24e34161aa0416547fd0fd71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a21891-256a-4cd4-b84d-ce75375ba786/48185913526.pdfIn PDF document text
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_c2dfc80cd26f4e76bccb242315c2904b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad8364eb-7129-4185-94aa-b2be886e50cf/ti-84_plus_ce_games_minecraft.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A6 4876 bytes
SHA-256: a4415b3355442183bd98a75eb69cc8df0ea540d97fb66db34920a9cc606b627a
font_01_sfnt_off0001311f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311F 12144 bytes
SHA-256: eb0b71a2ac26c056ea08995e8eae986400f4d93140711e2fb23e46d43408721d
font_02_sfnt_off00015885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15885 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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