Malicious PDF — malware analysis report

Static analysis result for SHA-256 22578b51b85b8b27…

MALICIOUS

PDF

47.2 KB Created: 2020-03-09 09:28:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 23e00f838fa90efe8322b50dc0567f47 SHA-1: da87da57adb7fe81bb04d49646c1be54c4851c29 SHA-256: 22578b51b85b8b27ad441a44faed120c627889727c49aa41caa710a52adf3fbd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to domains that appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely intended to redirect the user to malicious content or phishing pages. The primary attack pattern observed is the use of a link farm within a PDF to lure users to external, potentially malicious, websites.

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://feel-well.org/uploads/1/3/0/9/130969795/130969795.html#supercoiled+plasmid+gel+electrophoresis
    • http://www.ethicaldexterbeef.com.au/uploads/1/3/0/7/130739579/jilabopafosifarazota.pdf
    • http://maliciousprosecution.net/uploads/1/3/0/8/130813797/6690104.pdf
    • http://northernbeacheshousewash.com/uploads/1/3/0/5/130539348/kipefene.pdf
    • http://communitiesdefendingdemocracy.us/uploads/1/3/0/6/130639916/lutefejiw.pdf
    • http://www.bootsandbistros.com/uploads/1/3/0/7/130776211/kokugejugewo.pdf
    • http://starfishcenter.org/uploads/1/3/0/6/130639853/zeraduwavasipov.pdf
    • http://nashvilleperformancepsych.net/uploads/1/3/0/5/130589305/02d516fa5cf.pdf
    • http://celltekinnovations.org/uploads/1/3/0/6/130639355/7116869.pdf
    • http://rochesterbiochem.com/uploads/1/3/0/5/130588256/sejejojilowimok.pdf
    • http://shopgiftsfromtheheart.com/uploads/1/3/0/4/130476378/9933911.pdf
    • http://divinesimplicity.net/uploads/1/3/0/7/130776143/dilovakekijemukit.pdf
    • http://thelifeofleela.com/uploads/1/3/0/6/130621110/nuviditobita-lepabasuwoxi-kujagi-bofotal.pdf
    • http://imakeslideshows.com/uploads/1/3/0/6/130604808/kinaniwel_wesowoladudiseb.pdf
    • http://itoeyeproductions.com/uploads/1/3/0/7/130740050/bujatefumufutize.pdf
    • http://theluxycloset.online/uploads/1/3/0/6/130640020/7197a082.pdf
    • http://berardinotherealtaste.com/uploads/1/3/0/6/130604574/kubelukejaxi_mutidudaj_zuwimono.pdf
    • http://showtimerecords.co.za/uploads/1/3/0/2/130274315/nosewedilopabevade.pdf
    • http://porqueeseidiotasevetanbienyyono.com/uploads/1/3/0/9/130969131/13bfe8323.pdf
    • http://mx.chaletbruant.com/uploads/1/3/0/7/130775760/8332185.pdf
    • http://www.ersteversiontanja.com/uploads/1/3/0/2/130272095/230212.pdf
    • http://mail.brickalleybistro.com/uploads/1/3/0/6/130620594/fafetavog-mibojozumaf.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_off0000846b.bin
3ae832ce8184a49487f20d3858ba0080b729f620a90691e3015fb69525fc0223		 pdf-font-stream PDF embedded font (sfnt) at offset 0x846B 8424 bytes
font_01_sfnt_off0000a484.bin
4d9ec2aec8f1ca6bebe1b56492fd55a77bba3a6e98efb76508c1b835d4eb9912		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA484 2860 bytes

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