Malicious PDF — malware analysis report

Static analysis result for SHA-256 1590539fe05775c6…

MALICIOUS

PDF

37.5 KB Created: 2020-05-20 12:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03f9215f291323f2d8830ca2cbb97410 SHA-1: ac6e491ea2fe99f9d9d3f03f139505460cb9ef38 SHA-256: 1590539fe05775c61daddced69907090f470f462a548b30bfe62a0f3e1ae6fac
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded document body text appears to be obfuscated or corrupted, but the presence of numerous external URLs suggests an attempt to manipulate search engine results or distribute malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://terraverdesolutions.net/uploads/1/3/0/8/130874282/130874282.html#suma+teologica+santo+tomas+de+aquino+epub
    • http://perfecttempac.net/uploads/1/3/1/4/131452804/4683958.pdf
    • http://happyhomehelper.com/uploads/1/3/0/3/130323298/mibaxilipuneb.pdf
    • http://moneywealth.org/uploads/1/3/0/6/130639192/nipitoremu.pdf
    • http://zeltiaytoma.com/uploads/1/3/1/3/131380756/5408048.pdf
    • http://big-boss-money.com/uploads/1/3/0/5/130539270/7580023.pdf
    • http://anxietyandocdcounselingclinic.com/uploads/1/3/0/6/130639076/sirezo-poxojetawa-vatek-nunibupaxo.pdf
    • http://budobanter.com/uploads/1/3/1/8/131857890/4e4a4bdb150.pdf
    • http://solbirdenergy.com/uploads/1/3/0/5/130539338/kesoluduxugodob.pdf
    • http://watermandigitalcinema.com/uploads/1/3/0/6/130605435/zovivujapebubuvi.pdf
    • http://valbuenadeveloper.com/uploads/1/3/1/4/131452917/513751.pdf
    • http://centagonhr.com/uploads/1/3/1/4/131438570/456493.pdf
    • http://annabrasher.com/uploads/1/3/1/3/131381919/vuvezowenamotuf_zofetajuv_zegakure.pdf
    • http://onbeachboutique.com/uploads/1/3/0/4/130436521/d26d11fd21a.pdf
    • http://fesnp.org/uploads/1/3/1/4/131437756/vufefur_bavufofixose_veraguve_firatububabele.pdf
    • http://mijneigencoach.com/uploads/1/3/0/5/130539203/xuxenarudoxizeviso.pdf
    • http://carolinehanstke.com/uploads/1/3/0/6/130639236/lokuloxezivam.pdf
    • http://californiazion.com/uploads/1/3/1/0/131071312/7268101.pdf
    • http://martine-antoinette.com/uploads/1/3/1/6/131637276/xiveranarumer-xibumagegugab-nomiza.pdf
    • http://bggltd.net/uploads/1/3/0/7/130775752/jurofopukakaxil.pdf
    • http://elabuelitocafe.com/uploads/1/3/0/6/130621607/7943548.pdf
    • http://dbconcertband.com/uploads/1/3/1/6/131606253/fiwopuxer-jizanuloganuji-dimeganojubu-bexigiwanepa.pdf
    • http://thecare888.com/uploads/1/3/0/6/130640229/bedez.pdf
    • http://chattanoogacrawlspaceencapsulations.com/uploads/1/3/0/9/130969798/7617876.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_off000061bf.bin
e589a639d684a5e9e81c3c19573d14879ba6b0302db48882702bb7acc1550b63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BF 12516 bytes

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