Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2deab7b88aa297…

MALICIOUS

PDF

36.0 KB Created: 2020-03-22 12:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ec3ca5a3bb4ccb24f9c326830ee2001d SHA-1: af73239f7cb314743573ff60c74080798eb9f867 SHA-256: 8a2deab7b88aa297055eb29803cf224356bc04c3e42858e75ef2d6e1240efde8
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many with numeric slugs, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text that appears to be a lure for educational content, directing users to external URLs. The primary attack pattern involves redirecting users to potentially malicious websites hosted on numerous domains.

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://joyitforward.org/uploads/1/3/0/2/130289632/130289632.html#realidades+3+capitulo+4+prueba+4-6
    • http://griffinpaintingandmaintenanceptyltd.com/uploads/1/3/0/7/130739498/xorewufitago.pdf
    • http://mensajeriateamgo.com/uploads/1/3/0/6/130605069/zuvubipigij_wabaxev_pobojamusum_lefobola.pdf
    • http://www.tml-photography.com/uploads/1/3/0/7/130775075/3bf7a00ef40bf.pdf
    • http://shirku.net/uploads/1/3/0/6/130604414/mugaf-xovazaxisu-xudeku.pdf
    • http://annamatchey.com/uploads/1/3/0/6/130604113/dabovu.pdf
    • http://tap-folio.com/uploads/1/3/0/6/130639136/jinegifiludu-kifixef.pdf
    • http://giantsballoons.com/uploads/1/3/0/2/130287872/5247228.pdf
    • http://www.beewellkids.acupuncturevegas.com/uploads/1/3/0/6/130603851/2403dac871780a.pdf
    • http://dhi-nc.com/uploads/1/3/0/7/130739024/tesodafozixan.pdf
    • http://webmail.2ndchancearchery.com/uploads/1/3/0/9/130969555/2138289.pdf
    • http://www.consoleduel.net/uploads/1/3/0/3/130379341/gitufojixuso_waposirub.pdf
    • http://thetribe.club/uploads/1/3/0/7/130740464/f0cf162.pdf
    • http://abthrift.org/uploads/1/3/0/8/130814645/zotibaxewid_tebafiketiwi.pdf
    • http://www.7hbuildingsupplies.com/uploads/1/3/0/6/130620265/eb939e1.pdf
    • http://wildflowerfilm.com/uploads/1/3/0/2/130289496/xefagunije_tisojolukod_xozazedederum.pdf
    • http://www.omegabeautiful.com/uploads/1/3/0/7/130739202/xogegunetazas.pdf
    • http://www.practevo.com/uploads/1/3/0/5/130588384/2402093.pdf
    • http://wallinba.com/uploads/1/3/0/8/130814717/217c55d5e.pdf
    • http://mta-sts.mail.7161hydra.com/uploads/1/3/0/8/130814250/3536712.pdf
    • http://nataliahermida.com/uploads/1/3/0/7/130739016/2d2fd01.pdf
    • http://mail.houseoffleek.com/uploads/1/3/0/5/130550684/1803b.pdf
    • http://www.blythetierneydever.com/uploads/1/3/1/0/131070382/kugujowatakek.pdf
    • http://thefusioncollection.com/uploads/1/3/0/3/130323471/30532aa607.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_off00006674.bin
cde2882c8d581bb65278e69a60ab7a2cbd96f765754cd63979a62883549ec423		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6674 6932 bytes

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