Malicious PDF — malware analysis report

Static analysis result for SHA-256 916a9b4a95f4fcad…

MALICIOUS

PDF

38.8 KB Created: 2020-04-09 22:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2d1e7d62ab4045dca6c1c2d2ef7e8830 SHA-1: e4e22d004f426d2a5c3b54fc67bfb5f6cb88de07 SHA-256: 916a9b4a95f4fcadf5127acb7f3de7dcd9f7d943c024136c39e3b4086d6f46d6
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified as a PDF SEO link farm. The primary URL points to a page discussing 'Proximal row carpectomy rehab', suggesting a lure to attract clicks. The ML classifier strongly indicated maliciousness, and the presence of numerous links to potentially compromised or malicious domains supports this assessment. No scripts were extracted, but the structure itself is indicative of a malicious intent to redirect users.

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://agpmav.com/uploads/1/3/0/5/130590672/130590672.html#proximal+row+carpectomy+rehab
    • http://gallerysiestakey.com/uploads/1/3/0/3/130323319/4004314.pdf
    • http://essentialhomecleaning.info/uploads/1/3/1/3/131397971/7153515.pdf
    • http://judynijman.com/uploads/1/3/1/3/131379948/338880.pdf
    • http://thewillowworks.org/uploads/1/3/1/4/131408664/golodagu_bujazogikuf_moxaw_vavaxajedaji.pdf
    • http://ultralateral.ca/uploads/1/3/0/8/130813906/liluta_gupibunemijoj_sotipetajepo_xerison.pdf
    • http://honorableconstruction.com/uploads/1/3/1/3/131383763/labajawogaziw.pdf
    • http://badgermotors.net/uploads/1/3/0/7/130776309/cee18163a8.pdf
    • http://glowing-skin-care.com/uploads/1/3/0/2/130289238/muxafajo.pdf
    • http://tearoseclothing.com/uploads/1/3/0/4/130490875/tuzunib.pdf
    • http://thecollectionbysafari.com/uploads/1/3/0/6/130621470/5648673.pdf
    • http://twopeasbaby.com/uploads/1/3/0/7/130775792/bonifasigede.pdf
    • http://tmc-mli.com/uploads/1/3/1/3/131380297/4565419.pdf
    • http://cantinafellini.com/uploads/1/3/0/7/130739303/1441746.pdf
    • http://bigleaffoundation.org/uploads/1/3/1/4/131454034/94e9a70e890.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dad.bin
1f84a016dbd3b5d25f980afd26a77f9be67eba19b06afdc421f216898641f8b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAD 8768 bytes

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