Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4f3de414c894cb…

MALICIOUS

PDF

35.4 KB Created: 2020-06-05 00:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: c009db7f4b85190a2b625f7e79cc9ba1 SHA-1: bfd9dc66d00dfd383c37993bf83b9a1ea51bd158 SHA-256: db4f3de414c894cb59a8c955ce4ac0a893afd9eb4ba1df691072ce217a39b33a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted from this sample, but the extensive linking pattern is sufficient to infer a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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 http://fbfitness.no/uploads/1/3/0/6/130604231/130604231.html#homeready+framework+homeownership+qu PDF link annotation
    • http://blatherscatdesign.com/uploads/1/3/1/4/131438071/dujeso.pdfIn PDF document text
    • http://corevolutionart.com/uploads/1/3/0/5/130538922/55b82f060.pdfIn PDF document text
    • http://linzlia.com/uploads/1/3/0/8/130815277/tipevabab.pdfIn PDF document text
    • http://jupiterlevel.com/uploads/1/3/0/5/130589057/kemenagov.pdfIn PDF document text
    • http://kasnia.org/uploads/1/3/0/3/130323697/6658768.pdfIn PDF document text
    • http://74-123-77-169.mgwnet.com/uploads/1/3/0/3/130323616/768c183fd3b.pdfIn PDF document text
    • http://yogawithlb.org/uploads/1/3/0/7/130739856/39293a2f102.pdfIn PDF document text
    • http://mamaglows.com/uploads/1/3/0/6/130640214/tulotipinemebakogusa.pdfIn PDF document text
    • http://steps-ahead-dance.com/uploads/1/3/0/5/130550774/aa86e7.pdfIn PDF document text
    • http://fbfitness.no/uploads/1/3/0/6/130604231/terms.htmlIn PDF document text
    • http://fbfitness.no/uploads/1/3/0/6/130604231/dmca.htmlIn PDF document text
    • http://fbfitness.no/uploads/1/3/0/6/130604231/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jisezos.files.wordpress.com/2020/06/kagelerixefogetojad.pdfIn PDF document text
    • https://wolodexizip.files.wordpress.com/2020/06/50179588462.pdfIn PDF document text
    • https://finuroni.files.wordpress.com/2020/06/gukemevopuk.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D92 11012 bytes
SHA-256: 86ff491e83123eb3fbeab8e627b018bcffa0972bec833cee41c25c6eddd49094