Malicious PDF — malware analysis report

Static analysis result for SHA-256 665c1786b3e1354b…

MALICIOUS

PDF

37.6 KB Created: 2020-03-13 02:12:29 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 75c46114e05e559d62acbc6862e765b1 SHA-1: 565d43dd8de46bdb06cee32a4d5212e953a18054 SHA-256: 665c1786b3e1354b970c3111a6b72cc0b00ea17e3f9841602e16f02311e2624d
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern appears to be a link farm designed to direct users to numerous external websites, potentially for SEO manipulation or to host further malicious content. No scripts were extracted, but the presence of many external URLs suggests a phishing or content-luring attempt.

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://webdisk.stefanaarnio.com/uploads/1/3/0/7/130739686/130739686.html#metabolic+acidosis+abg+picture
    • http://dakotaneurology.com/uploads/1/3/0/6/130640059/loriw.pdf
    • http://www.longhornpva.com/uploads/1/3/0/6/130605255/8ec57.pdf
    • http://www.brownkrowns.com/uploads/1/3/0/5/130588893/6742848.pdf
    • http://kingdomartisans.org/uploads/1/3/0/7/130775493/2877366.pdf
    • http://centralrefrigerationinc.us/uploads/1/3/0/5/130545573/586fa25ab2f2.pdf
    • http://bastionaudio.co.uk/uploads/1/3/0/8/130814902/sewidamifasodod_kaputurob_bakasizejepobi_jiwobekajobedun.pdf
    • http://bucketmedia.net/uploads/1/3/0/7/130775241/rinakopesolamiwobor.pdf
    • http://bs215.org/uploads/1/3/0/7/130738914/tosuxepowi.pdf
    • http://desertdreamxxx.com/uploads/1/3/0/4/130491757/wekose.pdf
    • http://nicosnerdnews.de/uploads/1/3/0/7/130774972/difopafogotere.pdf
    • http://maclassenumerique.be/uploads/1/3/0/4/130476471/meluk.pdf
    • http://www.alanamarieartworks.ca/uploads/1/3/0/6/130621369/xoxisanobineluzi.pdf
    • http://www.thepinktreasurebox.com/uploads/1/3/0/2/130291640/melevokese_lagenolunadawa_nukijututazinam.pdf
    • http://www.pakpashtoon.com/uploads/1/3/0/7/130775729/7a4b02f693f9.pdf
    • http://nakedtrackdays.net/uploads/1/3/0/7/130739918/teridol.pdf
    • http://hostmaster.wicksteadhorseplay.co.uk/uploads/1/3/0/2/130289424/5eb5f3c44d9ce6.pdf
    • http://74-123-79-52.mgwnet.com/uploads/1/3/0/7/130739324/a55f8.pdf
    • http://aesbuildingakron.com/uploads/1/3/0/7/130738596/84e4f4cba7f41.pdf
    • http://confluenceconsulting.net/uploads/1/3/0/4/130490665/804889.pdf
    • http://www.davidcamillotucci.com/uploads/1/3/0/8/130874126/pefopivaturovu.pdf
    • http://montanahollidayglass.com/uploads/1/3/0/6/130604456/resujumo_toxoxixibiroji.pdf
    • http://lltraininginstitute.net/uploads/1/3/0/2/130291507/2014737.pdf
    • http://admin.panstream.co.uk/uploads/1/3/0/2/130272994/liviwulo_tafepivu_busuluv.pdf
    • http://www.readglimpsewithin.com/uploads/1/3/0/8/130813059/dikoworoxixoririrug.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_off000069ed.bin
3242295c93f69bb29cb8f87ce618e18481f9c5cb697512cb33b470cc527c25c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69ED 7984 bytes

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