Malicious PDF — malware analysis report

Static analysis result for SHA-256 13afed2976438687…

MALICIOUS

PDF

43.6 KB Created: 2020-03-16 16:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5aff952cf9da6c8b14b4d25c2fe15aec SHA-1: c24c4b0027b62452b7a87a5fe380c80a6e24e86d SHA-256: 13afed297643868783f04fb5088bf3a286bc44f6beaa88685e956f486a145876
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by an ML classifier as malicious. It contains a large number of external links, many of which are structured as numeric slugs, indicating a potential link farm for SEO manipulation or to host malicious content. The document body itself is largely unreadable but contains a URL that matches one of the extracted links.

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://advance-it.net/uploads/1/3/0/7/130740252/130740252.html#calculations+using+gibbs+free+energy+equation+worksheet
    • http://pe-uae.com/uploads/1/3/0/4/130483260/monopupefelaxogoxedu.pdf
    • http://insideoutcoach.nyc/uploads/1/3/1/0/131070703/5d183ec62c.pdf
    • http://marc-renaud.ch/uploads/1/3/0/8/130874478/fogazirenarobelazid.pdf
    • http://www.relaxationpathways.com/uploads/1/3/0/7/130775197/barujixezojibibuga.pdf
    • http://www.theevanbrown.com/uploads/1/3/0/2/130288492/tijikukapagib.pdf
    • http://optikstudios.io/uploads/1/3/0/6/130620479/6741033.pdf
    • http://www.safebarsboston.com/uploads/1/3/0/5/130589998/232365.pdf
    • http://ajameskolar.com/uploads/1/3/0/3/130313605/nurosiro.pdf
    • http://stonescapecompanies.com/uploads/1/3/0/2/130271035/64f2c171634.pdf
    • http://hostmaster.irissrl.org/uploads/1/3/0/7/130740429/5659667.pdf
    • http://funlolacokershop.com/uploads/1/3/0/9/130969190/6956810.pdf
    • http://jerremyholland.net/uploads/1/3/0/5/130588810/dc0b64ce64007ac.pdf
    • http://mta-sts.jeffcubos.com/uploads/1/3/0/5/130588640/28182765.pdf
    • http://usf.graysbooks.com/uploads/1/3/0/6/130604317/7129234.pdf
    • http://indianarivers.org/uploads/1/3/0/8/130873962/dovixinotob-beraseberaje-mepexoxire-moluxananefezil.pdf
    • http://www.antsrecovery.co.uk/uploads/1/3/0/6/130605368/mezize.pdf
    • http://hostmaster.newtemployment.co.uk/uploads/1/3/0/6/130622013/pemikuna.pdf
    • http://digitaltacklebox.ca/uploads/1/3/0/3/130323329/4629352.pdf
    • http://strawhatgames.com/uploads/1/3/0/3/130313340/jagosunogova.pdf
    • http://theliafund.org/uploads/1/3/0/6/130604377/9131251.pdf
    • http://webdisk.brandtmarineinc.com/uploads/1/3/0/3/130323092/3d08833e.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_off0000823e.bin
f2464b5a1df83a8238f9c2e5f8239a2510f770b18c440a9158a730e443dc5d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x823E 7692 bytes

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