Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87376c150dd7507…

MALICIOUS

PDF

69.7 KB Created: 2021-01-24 12:16:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 320b02b05b3401a75da71119f2779328 SHA-1: 7a77ad25bc1331454c628b53bec9230c889d8b50 SHA-256: a87376c150dd7507111dcf80f797736ac59241128cf51c3b658038809a90d26d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a "PDF link farm". The document body, though heavily obfuscated, contains keywords related to templates and financial documents, suggesting a lure. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/aws?utm_term=monthly+balance+sheet+template+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4394066/normal_600861ba9e377.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/T8K8Ygi/55586048871.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386607/normal_5fcf275509765.pdfIn PDF document text
    • https://cdn.sqhk.co/diwewiduvaz/JhabYih/pogog.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/ge4oLDG/75654428051.pdfIn PDF document text
    • https://damanula.weebly.com/uploads/1/3/1/8/131856109/wetumilijoxoku-wuvalowisikix-xukowedagad.pdfIn PDF document text
    • http://criticcxck.space/diastasis_of_the_rectus_abdominis_muscles_ctpt4mq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_5fe8694b56f9d.pdfIn PDF document text
    • https://sakotitalivuvu.weebly.com/uploads/1/3/4/8/134887700/7077333.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/j8bRzhd/4336050738.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/fomalunoxa_lesozi_meporipewiga_zozowodaxunijel.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/nedijowewoded/drunk_parents_movie_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/52664683088.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/how_to_double_space_in_excel_spreadsheet.pdfIn PDF document text
    • http://wepilige.epizy.com/77110693054.pdfIn PDF document text
    • http://melaworogafema.epizy.com/logical_connectors_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/maresakalupomo.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_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 5500 bytes
SHA-256: bfd99ef7d7c1d42033fa5cb77a857e71ae01503e834186ae81ada092eb5d2820
font_01_sfnt_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 10184 bytes
SHA-256: 825320ba9decc022b7f62879d26562c8cab4a3e0fbbfb095c6f65603286798bc

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