Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73ccac2fc935c4a…

MALICIOUS

PDF

35.5 KB Created: 2020-03-26 02:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c834a60379d22af27e5d16bd41be2e6d SHA-1: 41cdd3ed33e00003e47b6ef2b499a766940e04fb SHA-256: e73ccac2fc935c4a6e0998b57a8fef74b06ce40cd63e4b7d780f9246e3518648
94 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, a technique commonly used for SEO poisoning or to direct users to malicious websites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body text, though partially obfuscated, includes a URL that aligns with the observed link farm behavior.

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://jayden-rose-leon.com/uploads/1/3/0/8/130813592/130813592.html#palabras+con+silaba+tonica
    • http://tammyandtommystravels.com/uploads/1/3/0/5/130551303/7647572.pdf
    • http://cattywhompus.net/uploads/1/3/0/7/130738903/1115b498a8.pdf
    • http://databunk.com/uploads/1/3/0/8/130873860/cfea6e75736ed.pdf
    • http://jacknagro.com/uploads/1/3/0/6/130640178/sumugus.pdf
    • http://reicoinvestment.com/uploads/1/3/0/6/130605506/8714a0be02c4b6.pdf
    • http://martialarttemple.com/uploads/1/3/0/3/130379114/048cbb952.pdf
    • http://liceotomasmorales.com/uploads/1/3/0/6/130639147/xoxenegugezaxefal.pdf
    • http://heavenlypeaces.net/uploads/1/3/0/5/130544872/gizosolevumarun_moguzezipez_gezekop.pdf
    • http://theecakediva.com/uploads/1/3/0/6/130639205/4801416.pdf
    • http://fryshusetbasket.com/uploads/1/3/0/6/130604011/tejotukavem_xovewazefemo_fetosijajoz_tamosun.pdf
    • http://safeguard-teply.us/uploads/1/3/0/4/130489431/fofokexanotuz_rusufurij_lufakibota_majaf.pdf
    • http://mypecans.com/uploads/1/3/0/4/130476130/6877594.pdf
    • http://abovebeyondresidentialcare.com/uploads/1/3/0/7/130738697/13a548dee145f.pdf
    • http://entretienamenagementinc.com/uploads/1/3/0/3/130379298/2482389.pdf
    • http://mta-sts.mail.benefactoryllc.com/uploads/1/3/0/4/130476229/b13161460de9.pdf
    • http://joyfilled.net/uploads/1/3/0/6/130620854/4368891.pdf
    • http://sabrinamurton.org/uploads/1/3/0/6/130604552/rutoril-pegunesitefu-dadevek.pdf
    • http://sabandina.com/uploads/1/3/0/6/130604081/kowekedinet.pdf
    • http://molexastucco.com/uploads/1/3/0/5/130543878/7443203.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_off00006017.bin
665977a3223cd326f2503595098ca50c902f132b987221d21e944b4c7cff0786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6017 8588 bytes

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