Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c73233e4677962…

MALICIOUS

PDF

39.2 KB Created: 2020-04-02 13:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2acb3901c31f95477e7063458227afda SHA-1: bbe6592942d2f5f81b57d1a82dd841e1d71a79e6 SHA-256: 51c73233e4677962a9dd2d0b3f5b643b4b2a806ca1a4c58bab0a12c49640e391
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common technique for SEO spam or to redirect users to malicious sites. The document body, though obfuscated, contains text related to 'Integrales de linea ejercicios pdf' and references to wkhtmltopdf, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a link farm attack pattern.

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://bgallagher.solutions/uploads/1/3/1/3/131398015/131398015.html#integrales+de+linea+ejercicios+pdf
    • http://abbydecoratingden.com/uploads/1/3/0/7/130775222/mowix.pdf
    • http://beforethestorm.org/uploads/1/3/1/3/131384166/16c942.pdf
    • http://littleblessingsofanoka.com/uploads/1/3/0/7/130776386/c9076ae3c696428.pdf
    • http://communitydevelopmentcorp.org/uploads/1/3/0/6/130605278/fixikebagoboduk.pdf
    • http://reclaimingfemininefire.com/uploads/1/3/0/2/130288557/soruxuxigigipesa.pdf
    • http://sirofa.com/uploads/1/3/0/7/130738780/bugut-fibuvutukanep-dexudibame.pdf
    • http://clarioncountygop.net/uploads/1/3/1/1/131164352/vilak_fobun_zusimojofa.pdf
    • http://sinusitisclear.com/uploads/1/3/0/4/130476525/senojizasuzeruw.pdf
    • http://madeformediamarketing.com/uploads/1/3/0/7/130739793/rogopavi.pdf
    • http://familycareafterbirth.com/uploads/1/3/0/4/130476385/budutisi.pdf
    • http://abfvuxsva.se/uploads/1/3/0/6/130604638/678400.pdf
    • http://a1postal.net/uploads/1/3/0/4/130483146/tiferimovevejaba.pdf
    • http://nausettherapy.com/uploads/1/3/0/4/130435654/lugukozexafakafuki.pdf
    • http://yorktownsepta.org/uploads/1/3/0/7/130740015/livowuzurutasodu.pdf
    • http://glassworx.info/uploads/1/3/1/4/131437513/8648377.pdf
    • http://jollymaidhousecleaning.com/uploads/1/3/1/3/131398101/a235e4897.pdf
    • http://takethecollegepath.com/uploads/1/3/0/6/130639905/6e57cec8d6.pdf
    • http://scapri.com/uploads/1/3/0/5/130539728/5bc6ee86c.pdf
    • http://jmillerinsurance.net/uploads/1/3/0/2/130289601/lixunotituwojepate.pdf
    • http://mariexgt.com/uploads/1/3/0/8/130873976/baafed5d1787aa8.pdf
    • http://bobflintceramics.com/uploads/1/3/0/2/130272365/e78821cd29.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_off00005f14.bin
668c7574bf53aa3fd0c220682f4064e059adcd83392725c428ad12b7bbb7e40e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F14 7016 bytes
font_01_sfnt_off00007988.bin
0b85d885e9b192d834d2a7a79a3caef659b09d18a65935c804b4a45caff4ed8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7988 16108 bytes

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