Malicious PDF — malware analysis report

Static analysis result for SHA-256 f081db580a7951fe…

MALICIOUS

PDF

51.1 KB Created: 2020-03-08 02:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb061217027e2f65833e0ef819cd89ef SHA-1: cbadc96789a999de9f21e5f96acef38578786383 SHA-256: f081db580a7951fe19f308a475a41eb38731be434fe66cda0378726bc5b058df
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a mechanism to distribute further malicious content. The document body mentions 'Airtel digital tv recharge plans list', likely a lure to entice users to click on the embedded links. The ML classifier strongly flagged this PDF as malicious.

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://libertycharleston.gammaxiques.org/uploads/1/3/0/4/130488442/130488442.html#airtel+digital+tv+recharge+plans+list
    • http://woodenshoesailing.com/uploads/1/3/0/4/130478067/3434443.pdf
    • http://familyhairdesignwh.com/uploads/1/3/0/3/130323235/bikele_luwetariruz.pdf
    • http://willbebrave.com/uploads/1/3/0/2/130272853/bavuxaju.pdf
    • http://blazeclan.fr/uploads/1/3/0/9/130969421/newagok.pdf
    • http://fenster-linz.at/uploads/1/3/0/5/130546244/1c0c206f9e.pdf
    • http://rosendahlmd.com/uploads/1/3/0/7/130738629/3894934.pdf
    • http://immediateinsight.com/uploads/1/3/0/2/130270781/8522158.pdf
    • http://kathleenmaree.com/uploads/1/3/0/7/130739530/marivamim.pdf
    • http://imyd.com/uploads/1/3/0/5/130544823/jogisev.pdf
    • http://www.endgamefit.com/uploads/1/3/0/5/130589399/10226380f161fac.pdf
    • http://memorieseverlasting.co.uk/uploads/1/3/0/2/130289211/gojutedexozugiwovofi.pdf
    • http://wildernesscreativeco.com/uploads/1/3/0/6/130639977/7965906.pdf
    • http://covingtoneconomymeatmarket.com/uploads/1/3/0/6/130621063/xawabenalopunapo.pdf
    • http://reddingwoodrvpark.com/uploads/1/3/0/6/130621437/cc050d770b9225.pdf
    • http://www.thequiltstudio.com/uploads/1/3/0/5/130543598/bugeleta.pdf
    • http://www.rondella.es/uploads/1/3/0/7/130739274/c1bde.pdf
    • http://minimalistworkshop.com/uploads/1/3/0/4/130476816/zugefux.pdf
    • http://www.mechart.net/uploads/1/3/0/6/130603977/8337988.pdf
    • http://sdrealtor.xyz/uploads/1/3/0/6/130621005/vinogadorez.pdf
    • http://taisawa.com/uploads/1/3/0/7/130740262/tijaso.pdf
    • http://swaffle.com/uploads/1/3/0/8/130813818/e327e.pdf
    • http://www.gendernaturalist.com/uploads/1/3/0/7/130739706/877654.pdf
    • http://partabcdeasyas123.com/uploads/1/3/0/6/130604632/mobojugigoz_sedejis_daganib.pdf
    • http://electbradsupervisor.com/uploads/1/3/0/6/130604388/8897842.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088e2.bin
58f2f13d558fca6c305d3aae5c1cc8d72b37e46d83bfc2f2f29016be6dc5cb51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88E2 8192 bytes
font_01_sfnt_off0000a892.bin
32b54217619f9438721b423dc2f4f4da0f78781b0811ea49af2be6b0310ecf56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA892 16164 bytes

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