Malicious PDF — malware analysis report

Static analysis result for SHA-256 846220d1656da0e1…

MALICIOUS

PDF

34.6 KB Created: 2020-03-25 06:51:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: aac7ef56641dc30508bb05c44047dd1e SHA-1: f0dda979dec1cbee84c0531de65eea502db404aa SHA-256: 846220d1656da0e1cf660436916b21a5fdf81272177301cc66e9c9d1bd2f26cb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs supports a phishing or malicious content delivery attempt. No scripts were extracted, but the structure implies a lure to external resources.

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://authnstuff.com/uploads/1/3/0/4/130435553/130435553.html#english+conversation+-+learn+english+speaking+english+subtitles+lesson+11+-+youtube
    • http://i2kpetro.com/uploads/1/3/0/8/130813756/7420960.pdf
    • http://joyzwish.com/uploads/1/3/0/3/130323295/mulipo.pdf
    • http://animalrescueallies.net/uploads/1/3/0/5/130551700/zokun_kowitoxomagax.pdf
    • http://plazatravelinc.net/uploads/1/3/0/7/130740207/nizijufimogene-bovebokirisita.pdf
    • http://ramysjoy.com/uploads/1/3/0/6/130621533/735113.pdf
    • http://venture.travel/uploads/1/3/0/9/130969931/ecce49ace628.pdf
    • http://midwestairsoftgroup.net/uploads/1/3/0/6/130639668/rolaxufexo.pdf
    • http://mkebookscoach.com/uploads/1/3/0/6/130604525/2714047.pdf
    • http://emmahamiltonphotography.co.uk/uploads/1/3/0/6/130621071/2215791.pdf
    • http://talesfromsixthgrade.com/uploads/1/3/0/7/130740012/5037057.pdf
    • http://brizo-kennel.com/uploads/1/3/0/5/130538863/f638bbd.pdf
    • http://carlisle-taxi-number.com/uploads/1/3/0/4/130476347/katubenefolix-widapurozuxe-tasexetuvozanik.pdf
    • http://balance-your-nutrition.ca/uploads/1/3/0/2/130272070/zurazaxabonuz-lovopijig-pumosowejunul-rarolulumovodov.pdf
    • http://threevinesinc.com/uploads/1/3/0/6/130604627/9377174.pdf
    • http://ns1.lumapixel.com/uploads/1/3/0/3/130323884/nizaveduvebil.pdf
    • http://bsa-sccc-pack301.com/uploads/1/3/0/6/130621859/mibutimirewexelimago.pdf
    • http://www.ourglassboutiqueonline.com/uploads/1/3/0/7/130775441/siwewofatunino.pdf
    • http://coralharbourmarinaresort.com/uploads/1/3/1/0/131070508/rabuve-rigonegaba.pdf
    • http://daffodilhill.org/uploads/1/3/0/8/130814284/lijifexujamagolofi.pdf
    • http://bradwarnermedia.com/uploads/1/3/0/4/130489228/solebi_rikofelipazem_xiginozonepe.pdf
    • http://soundsmusic.co.uk/uploads/1/3/0/8/130874435/fcb40d9a137.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_off00006103.bin
99f7fa3e4a80a0503cd4f60664abe5f614fcda1bed3284c4d7a49ba813b9c858		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6103 6712 bytes

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