Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba70ee40b6710969…

MALICIOUS

PDF

49.4 KB Created: 2020-04-16 13:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 35752494daa1404fe0f22effb85f0aee SHA-1: 1fb93a10c3528d84cbd6bffc8b543f39db7ad9bd SHA-256: ba70ee40b6710969dc3cfdf83e33fb20f5fc2145114da48f3fc587f610f3389d
94 Risk Score

Malware Insights

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

This PDF document employs a link farm technique, embedding numerous external URLs that masquerade as legitimate content. The primary lure appears to be related to 'American red cross bls instructor test answers', directing users to a specific URL. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://siouxlandbirthingcenter.org/uploads/1/3/0/5/130539697/130539697.html#american+red+cross+bls+instructor+test+answers
    • http://jordanshealthykitchen.com/uploads/1/3/0/7/130739433/4158934.pdf
    • http://rexbartergroup.com/uploads/1/3/1/4/131410187/jexalabedawita.pdf
    • http://newdaypainting.ca/uploads/1/3/0/6/130639347/563856.pdf
    • http://anchorstoragelc.com/uploads/1/3/0/2/130287882/sofodefedini_komopel.pdf
    • http://carsncoffeecafe.com/uploads/1/3/0/3/130379428/bajezuwofato.pdf
    • http://roderickfludd.com/uploads/1/3/0/9/130969000/kabirevepedax.pdf
    • http://organicbrandsolutions.net/uploads/1/3/0/6/130604780/7817b29e.pdf
    • http://msmstore.com/uploads/1/3/0/2/130271224/3387348.pdf
    • http://kamcoservicesllc.com/uploads/1/3/0/6/130605315/masubufakozol-kepedibefaxara-wutusuzonoj-jubeni.pdf
    • http://naadrywallllc.com/uploads/1/3/0/5/130590582/mebosoxunuz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f6b.bin
78eadb6e63ac598c4b177994253ed4ecd6c9aba8bb9c28e3ef450a0386bb10c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6B 8504 bytes
font_01_sfnt_off0000afe2.bin
63f5e27ee3d24cc00d413e59c301cc73ab377383609796993547673f2bea898c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE2 2600 bytes

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