Malicious PDF — malware analysis report

Static analysis result for SHA-256 91db1b8e03645540…

MALICIOUS

PDF

50.9 KB Created: 2020-03-20 03:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 52b1629f2ec0804e89592b51436270fc SHA-1: 7bd40f2b2a362719e36f7f2efb77223e74c7ebe6 SHA-256: 91db1b8e036455400b180e76574c806668e133b5107731ab091f8cf4e31d52aa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body contains a Spanish phrase about a square root, which appears to be a lure. The primary purpose seems to be directing users to a link farm of other PDF documents hosted on various domains, likely for SEO manipulation or to serve as a distribution point for further malicious content.

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://tuitionhotsauce.com/uploads/1/3/0/5/130551059/130551059.html#cual+es+la+raiz+cuadrada+de+81+elevado+a+la+4 PDF link annotation
    • http://jemzkamexpress.com/uploads/1/3/0/9/130969923/jodor-xazuxezuges.pdfIn PDF document text
    • http://swkitchen.com/uploads/1/3/0/2/130289658/6620123.pdfIn PDF document text
    • http://bankruptcyattorneycapecoral.org/uploads/1/3/0/2/130288456/kigesebuxigimi_vakamorepuj_zoxofi.pdfIn PDF document text
    • http://bayanesthesia.com/uploads/1/3/0/7/130775131/7599947.pdfIn PDF document text
    • http://shop.sportsbands.com/uploads/1/3/0/6/130604273/1660418.pdfIn PDF document text
    • http://focusantiglare.com/uploads/1/3/0/7/130739517/zixejapabej.pdfIn PDF document text
    • http://www.deveralogic.com/uploads/1/3/0/3/130379423/sejaduwepudi-nadol.pdfIn PDF document text
    • http://thathootchie.com/uploads/1/3/0/4/130436204/nisuxap.pdfIn PDF document text
    • http://mail.nollin.dk/uploads/1/3/0/8/130813025/ad56a7da6ec.pdfIn PDF document text
    • http://jakeberman.net/uploads/1/3/0/8/130814173/zisazofod.pdfIn PDF document text
    • http://moscowshamrocks.com/uploads/1/3/0/3/130379741/fffcfeeca1c949.pdfIn PDF document text
    • http://hostmaster.va-instrument.se/uploads/1/3/0/9/130969235/f01b8.pdfIn PDF document text
    • http://missionhere.org/uploads/1/3/0/6/130639712/a11eb485.pdfIn PDF document text
    • http://ucdllp.com/uploads/1/3/0/6/130604782/lalafabujuluwisa.pdfIn PDF document text
    • http://cecilyeiferle.com/uploads/1/3/0/9/130969813/fisasokavidimorabe.pdfIn PDF document text
    • http://8880evergreen.com/uploads/1/3/0/5/130590314/926ce13ad88.pdfIn PDF document text
    • http://www.owens-for-mayor.com/uploads/1/3/0/5/130588363/jogadapowasibatusu.pdfIn PDF document text
    • http://microfinanceprofessionals.net/uploads/1/3/0/5/130588712/8db14bc.pdfIn PDF document text
    • http://longislandrack.com/uploads/1/3/0/6/130604862/baxabano-dijanofeze-podavikix.pdfIn PDF document text
    • http://connectionsthruart.com/uploads/1/3/0/2/130289519/079d1562ea.pdfIn PDF document text
    • http://mrswatsonsroom.com/uploads/1/3/0/2/130291552/bifoso.pdfIn PDF document text
    • http://bsmart.be/uploads/1/3/0/4/130483478/be758.pdfIn PDF document text
    • http://shootouthoops.com/uploads/1/3/0/4/130483140/wenixu.pdfIn PDF document text
    • http://neverdonefiberfarms.com/uploads/1/3/0/6/130621873/0c7f98d8da62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74D3 8404 bytes
SHA-256: 463ba2397127b5a51e2f0a2ce211b79a44e7983736451884988f89276bf98b32
font_01_sfnt_off000093f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93F6 5016 bytes
SHA-256: 014b883c0d038e383903631a5fcffcc244b58e9f619ee7c1c744a32498a722c9
font_02_sfnt_off0000a489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA489 16360 bytes
SHA-256: 893b9af18feb1adfdf9be166e91a29f6579e446fc4e1cf2129b46ea14f7cb700

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