Malicious PDF — malware analysis report

Static analysis result for SHA-256 163e5ec6ca08e02f…

MALICIOUS

PDF

40.0 KB Created: 2020-03-12 08:00:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 44fd493102eeeaf0987ef77157f621d2 SHA-1: 77559c0efedcf29925b6bb52c1926e6de8e2f327 SHA-256: 163e5ec6ca08e02f16fca832330d796805ca8e3b7aecd2d5795421307011a53a
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 PDF files with numeric slugs, indicating a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains URLs that are likely used to redirect users to malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://wcd-qe6b02fu.mgh-r.ch/uploads/1/3/0/3/130379285/130379285.html#how+to+see+font+size+in+pdf
    • http://rcaleel.com/uploads/1/3/0/6/130639635/4ac74922894.pdf
    • http://chabamassagebangkok.com/uploads/1/3/0/5/130589151/manemazosizamimumu.pdf
    • http://webmail.jordantaxserviceinc.com/uploads/1/3/0/4/130483552/cda48c8b.pdf
    • http://midnightepiphanyband.net/uploads/1/3/0/5/130544072/81172.pdf
    • http://www.reginaristorante.com/uploads/1/3/0/7/130774990/pilolexidewor.pdf
    • http://footprintstutoring.com/uploads/1/3/0/4/130489230/lomesizunobid_lizufegotasi.pdf
    • http://boutiquenanamoda.com/uploads/1/3/0/6/130604625/junulugodemijuf-betesufodar-badaxev-nekojegu.pdf
    • http://ipsma.info/uploads/1/3/0/7/130776069/5277740.pdf
    • http://islandstyledelivery.com/uploads/1/3/0/5/130543588/9459026.pdf
    • http://www.discoverdesignlive.com/uploads/1/3/0/4/130489467/guvogutabazin.pdf
    • http://fhsandbox.com/uploads/1/3/0/8/130874526/wegafaxuxebagimug.pdf
    • http://brandyspureromance.com/uploads/1/3/0/3/130379363/273f3172f3cf70.pdf
    • http://rusticrosebarnweddings.com/uploads/1/3/0/3/130323145/4926849.pdf
    • http://webmail.circle5feeds.com/uploads/1/3/0/6/130639037/2783b.pdf
    • http://materialsdesign.net/uploads/1/3/0/4/130477074/sogazojopulem.pdf
    • http://anaplastology-clinic.com/uploads/1/3/0/6/130639396/7e3011a359c.pdf
    • http://playatpollys.co.uk/uploads/1/3/0/5/130541656/de964aa75.pdf
    • http://www.jenchuu.com/uploads/1/3/0/3/130313212/ligifep.pdf
    • http://hostmaster.oxfordbaptistchapel.org.uk/uploads/1/3/0/4/130483428/doxavivu.pdf
    • http://mail.marinakolovou.com/uploads/1/3/0/5/130551607/zejiritipodurabu.pdf
    • http://gregorymeadows.com/uploads/1/3/0/5/130588723/1ecd5084f354.pdf
    • http://sweethealinghands.com/uploads/1/3/0/3/130323401/movelijipuki.pdf
    • http://wlcftv.com/uploads/1/3/0/8/130815026/tonewi_xogamapilol.pdf
    • http://twodogspromotees.com/uploads/1/3/0/3/130313194/maxunedovutuvapesef.pdf
    • http://mykhalid.com/uploads/1/3/0/6/130620379/286d868deda19f7.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_off00007441.bin
1b45118425ee6e36bb44636ba51f6669b88d61e0c8c748637986c42e129bbcbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7441 7656 bytes

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