Malicious PDF — malware analysis report

Static analysis result for SHA-256 793bdadbd278c8a3…

MALICIOUS

PDF

79.6 KB Created: 2021-04-06 12:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a71fbc053d3612854524bfa7b1090e89 SHA-1: 8c59aa4d5407be2fc94320f7fdeaaa782f52e18e SHA-256: 793bdadbd278c8a3786364a24a9411b27da313613c38c7a5a74495c9a9f19ab8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=asme+section+v+2020+pdf PDF link annotation
    • https://guretaximijogu.weebly.com/uploads/1/3/0/7/130739376/a9a1068b.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/166292.pdfIn PDF document text
    • https://fijoxivivuf.weebly.com/uploads/1/3/4/0/134041864/fatepesolu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496153/normal_5ff84507efef5.pdfIn PDF document text
    • https://xuvuluvibes.weebly.com/uploads/1/3/4/4/134494650/nakitusasisisegig.pdfIn PDF document text
    • https://winozijatefazo.weebly.com/uploads/1/3/5/3/135327399/1a24f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_600ea17a647dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456671/normal_60523171c2a3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386839/normal_5fc705b7f2766.pdfIn PDF document text
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/eef5821.pdfIn PDF document text
    • https://worudunomazife.weebly.com/uploads/1/3/1/4/131483266/pedapikurolojekika.pdfIn PDF document text
    • https://zopewurexolo.weebly.com/uploads/1/3/4/5/134519391/bovitafepapuxuki.pdfIn PDF document text
    • https://pitidupokeni.weebly.com/uploads/1/3/4/4/134485339/2851992.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368251/normal_5fcede3997cf5.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/figidireki/8973518438.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_43185fb2199f4a7a9d49720a4a29d9e6.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_5f482303c86443088aba81a4b200b393.pdf?index=trueIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_cd427942adc945a5beb9273ce99ada36.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_523c0b22a773498aab4a994da8965a1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/apple_cider_vinegar_miracle_health_system.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_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 5284 bytes
SHA-256: 0febea1b059eedef78b3af0c0dfaab521a373e3f561b087f4769ba6966d22f9f
font_01_sfnt_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 1912 bytes
SHA-256: e9f8a3ef788f0cbd16162dfcacf3538d4d9f72d83e44e67f72eb93bd53224865
font_02_sfnt_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 10900 bytes
SHA-256: cf8207d4dfcaf71f81db5bb16255abdd111058d42d7328a40d1605a2790377be