Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d4e2c6d4dd22cb…

MALICIOUS

PDF

43.8 KB Created: 2020-03-22 04:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dfc407738d073eae319ca380d87d28dc SHA-1: 4c34362620f8cdae871229f63845d570ef7606b1 SHA-256: 59d4e2c6d4dd22cb62eaaa1f0f36c5ac7c60612200349802979bccc64031648d
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier with high confidence. It functions as a link farm, containing numerous external URLs that point to other PDF documents. The primary purpose appears to be SEO manipulation or distributing further malicious content through these linked PDFs. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external links generated for SEO purposes.

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://ithcog.org/uploads/1/3/0/5/130539875/130539875.html#modelo+biopsicosocial+psicologia+definicion
    • http://mta58.somekindofsimple.com/uploads/1/3/0/4/130489090/lobidemuwidakuv.pdf
    • http://cultafrica.org/uploads/1/3/0/6/130620976/rolenezora.pdf
    • http://chitowngala.com/uploads/1/3/0/7/130740001/nevofubak-fegofetapu-babipebizifofo-lajiviva.pdf
    • http://healthandsafetysystemsaustralia.com/uploads/1/3/0/4/130488946/jasanugere.pdf
    • http://mail15.sheng.studio/uploads/1/3/0/5/130546333/6815398.pdf
    • http://prolinesecurity.net/uploads/1/3/0/6/130620173/c79d2.pdf
    • http://msmckinney.com/uploads/1/3/0/8/130873841/begaza.pdf
    • http://blackdogcottagepublishing.com/uploads/1/3/0/5/130588570/susiwarowojazid.pdf
    • http://hostmaster.adubvd.ch/uploads/1/3/0/8/130815093/60b65995091.pdf
    • http://www.lisascheick.com/uploads/1/3/0/6/130620265/a0ad08e.pdf
    • http://untroubledminds.com/uploads/1/3/0/2/130288549/9c4ea3336.pdf
    • http://www.ecommplish.com/uploads/1/3/0/2/130291676/fc616c91.pdf
    • http://www.coffsclimateaction.org/uploads/1/3/0/5/130589156/463c52e7.pdf
    • http://www.casanovagreenmusic.com/uploads/1/3/0/3/130313150/galakimamikobipu.pdf
    • http://fortlinen.com/uploads/1/3/1/0/131071035/kenop_vupulerutojetow_gavoz_tosisidanexeto.pdf
    • http://theoriginalfarmersmarket.com/uploads/1/3/0/6/130604724/piwibi.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_off00008019.bin
dd48a53409018c54244b92953272e0d5ec88c8c4437f1d02c8bf6510c3c602be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8019 8756 bytes

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