Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d9848ca80cdd91…

MALICIOUS

PDF

37.0 KB Created: 2020-05-17 07:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e60f973c5e5f6b9858a0968680527ecf SHA-1: 12ac9816aaf2f5ff6e0ad290f254784b201479d1 SHA-256: 72d9848ca80cdd91483d3fc4c993a800eebfe54e4c5fa15592ce2fe9cea81ef8
136 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 other PDF files, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded URLs suggest a mechanism for redirecting users to potentially malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://itpnc.com/uploads/1/3/0/5/130588586/130588586.html#fraction+word+problems+worksheets+grade+5
    • http://kazumakbar.online/uploads/1/3/1/4/131408572/feacd1b8dcf469e.pdf
    • http://jerseycitytaxappeal.com/uploads/1/3/0/5/130543855/jezimibabowubu-zaxigu.pdf
    • http://seankramer.com/uploads/1/3/0/4/130489423/sipis_mojixegajewe.pdf
    • http://autismmomspeak.com/uploads/1/3/0/2/130270777/favufonije_vilukuwo_rexixi.pdf
    • http://roetsbrothersdrywall.net/uploads/1/3/0/4/130436140/e82803b098f.pdf
    • http://scollina.com/uploads/1/3/0/7/130775318/kodago.pdf
    • http://bluewolfcleaningservices.com/uploads/1/3/1/8/131857586/pomutidakif.pdf
    • http://mrowkaszprotawa.pl/uploads/1/3/1/3/131398129/jurulewe.pdf
    • http://ltylogisticaterrestredeyucatan.com/uploads/1/3/0/9/130969037/lepitelibopovez-lizoxigiwopi.pdf
    • http://harrycareys.com/uploads/1/3/0/6/130620282/d2ade.pdf
    • http://the-beauty-bar-store.com/uploads/1/3/0/2/130272415/5375207.pdf
    • http://lazyoxfarmkunekunes.com/uploads/1/3/1/6/131637019/106006257cf3b1e.pdf
    • http://wesous.com/uploads/1/3/0/5/130543488/jesepabefewezug.pdf
    • http://milonovitzphotography.net/uploads/1/3/0/7/130775692/0cba52d362c.pdf
    • http://ajameskolar.com/uploads/1/3/1/3/131382828/66f1b.pdf
    • http://psupport.us/uploads/1/3/0/4/130483322/7458918.pdf
    • http://jeffmaconconstruction.com/uploads/1/3/0/4/130476738/zajulenu_popodat_namujadiku_vezafedir.pdf
    • http://jacksonholemountainruns.com/uploads/1/3/1/3/131398085/9501745.pdf
    • http://hobmeierphotography.com/uploads/1/3/1/6/131637143/vuwokugobete-dapozamaf-lokota.pdf
    • http://anorthernmichiganlife.com/uploads/1/3/0/4/130435553/766dce3.pdf
    • http://builttosellcoaching.com/uploads/1/3/1/4/131438079/tofenuvubitifuv.pdf
    • http://whatwomenbuyforthemselves.com/uploads/1/3/0/6/130639081/wokezikake-sativodewadepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006831.bin
1d0148ad8fd895987e100d79e046c1931505f52c0249278ff9f8a868f0a00481		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6831 9316 bytes

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