Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cd90d4ab653165…

MALICIOUS

PDF

38.9 KB Created: 2020-06-14 02:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cac7976757382057d39ee849c87f23eb SHA-1: 0c1e7771495e5dc638e77150394e2a8dd1c32579 SHA-256: b6cd90d4ab6531658a65512e24f9da2950aaa422082a8adcb3cc7297823057c4
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially corrupted, contains Spanish text and embedded URLs, suggesting a lure to external content. The primary purpose appears to be directing users to a network of websites, likely for SEO manipulation or to host further malicious payloads.

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://horizonsmedicalcare.trevelle.com/uploads/1/3/1/4/131407165/131407165.html#d%25C3%25B3nde+puede+i+consigue+libre+catalog
    • http://construccionesfuncionalessa.com/uploads/1/3/0/4/130476004/098d681738a393.pdf
    • http://brightlightspreschool.com/uploads/1/3/1/4/131454238/lulizedeponureji.pdf
    • http://starteaseclothing.com/uploads/1/3/0/6/130639672/lalutosomubajeluput.pdf
    • http://gcsurveryors.designpreviewer.com/uploads/1/3/1/1/131164034/5457605.pdf
    • http://connectingdevelopers.com/uploads/1/3/1/4/131453250/2cdff3103.pdf
    • http://mta-sts.mail.daynapalazzolo.com/uploads/1/3/1/0/131070030/423893.pdf
    • http://shop.missabellahousekeeping.com/uploads/1/3/1/8/131871659/jusogorelutidor.pdf
    • http://jimsett.com/uploads/1/3/0/8/130814172/xolariwajuwokuz.pdf
    • http://turningpointdefensivesolutions.com/uploads/1/3/0/4/130436313/9559921.pdf
    • https://gorajeg.files.wordpress.com/2020/06/rojutuzozominagodiwudu.pdf
    • https://resudixam.files.wordpress.com/2020/06/73914305959.pdf
    • https://pirusuzu.files.wordpress.com/2020/06/xakaxuf.pdf
    • https://fimesijonoba.files.wordpress.com/2020/06/28764343900.pdf
    • https://bosogozaxige.files.wordpress.com/2020/06/36437580283.pdf
    • https://banaxog.files.wordpress.com/2020/06/dakifedus.pdf
    • https://tapizoluzed454878337.files.wordpress.com/2020/06/43638889437.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_off00006b2b.bin
82659fddaceb5334e8dce0814425aa508cd84ddaabdbd884420b47cf0f3e5ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2B 10780 bytes

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