Malicious PDF — malware analysis report

Static analysis result for SHA-256 109f9bb797deae2b…

MALICIOUS

PDF

50.4 KB Created: 2020-03-25 05:29:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e76a49088e169c799973f92a4383cdad SHA-1: e76bc5c576541c971998699805cb56e68bfca2b6 SHA-256: 109f9bb797deae2b22d079ffd376cfc238780a944abab3f660beeb2c2cc6436f
96 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 link farm. The primary purpose appears to be directing users to a multitude of other PDF documents hosted across various domains. This technique is often used for SEO manipulation or to distribute malicious payloads disguised as legitimate documents.

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://marmarworld.com/uploads/1/3/1/3/131383943/131383943.html#vocabulary+workshop+level+g+unit+4+answers+choosing+the+right+word
    • http://celeneryan.studio/uploads/1/3/0/5/130552034/5689951.pdf
    • http://pocolocoonline.com/uploads/1/3/0/4/130489351/nifad.pdf
    • http://msmohp.org/uploads/1/3/0/7/130740000/cb3383404211b9a.pdf
    • http://wellnessbydesignmn.com/uploads/1/3/0/6/130621554/9409838.pdf
    • http://doodlesoofos.com/uploads/1/3/0/8/130814110/serukajolexosa_fujibidosutul_datulimifo_bodinejifezim.pdf
    • http://good2go-go.com/uploads/1/3/0/2/130270990/mefoka_fuxid.pdf
    • http://www.juniorhigh.ch/uploads/1/3/0/6/130621525/c6d356076103.pdf
    • http://www.northeastmolosserdogclub.org/uploads/1/3/0/3/130313049/9be53e6.pdf
    • http://ryan-julie.com/uploads/1/3/0/7/130739540/9008262.pdf
    • http://immigrationhelpphiladelphia.com/uploads/1/3/0/3/130379175/8586263.pdf
    • http://cuddyhut.com/uploads/1/3/0/2/130288768/465553.pdf
    • http://thelifeyouwant.org/uploads/1/3/0/2/130271148/punukagibewivu.pdf
    • http://bezzii.com/uploads/1/3/0/6/130620970/nuvekex.pdf
    • http://www.stellamacdonaldautism.com/uploads/1/3/0/7/130775370/a5d2a.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088ad.bin
2888b6ae136f46c937075cf34222198e85dcec40fad7de6b239a8081cececba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88AD 7576 bytes
font_01_sfnt_off0000a636.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA636 16204 bytes

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