Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64db43397e12b45…

MALICIOUS

PDF

49.5 KB Created: 2020-04-07 19:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2757f746b6a90716b8d825b065505660 SHA-1: 39ad9aeba49aff99154906cd514e9f5c5118d460 SHA-256: a64db43397e12b45d87fab57fc566a64895f8e9ffc8a80f964cd9a2b00bb8e28
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body contains garbled text but also includes the URL 'http://perillianconsulting.com/uploads/1/3/0/7/130775391/130775391.html#porn+hub+gay+videos', which is also listed among the extracted URLs. No scripts were extracted from this sample.

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://perillianconsulting.com/uploads/1/3/0/7/130775391/130775391.html#porn+hub+gay+videos
    • http://suniquelyyours.com/uploads/1/3/0/8/130813818/mesopuwav_dotababojubir_mitutoximevemi.pdf
    • http://helpmehome.net/uploads/1/3/1/3/131381243/8599933.pdf
    • http://planb4pain.com/uploads/1/3/0/5/130539908/f9a4bcea5b.pdf
    • http://derrelsofdothan.com/uploads/1/3/0/6/130621973/bapegola_kojawigumabovo.pdf
    • http://cozycraftyboutique.com/uploads/1/3/0/2/130288887/kokewexulevisojub.pdf
    • http://woodhavenlane.com/uploads/1/3/0/2/130289541/fibedawa_jabewufu.pdf
    • http://paulburris.net/uploads/1/3/0/6/130604556/a52cc369a.pdf
    • http://mystatenislandlocksmith.com/uploads/1/3/0/2/130288644/9598763.pdf
    • http://greatpointlincoln.com/uploads/1/3/0/6/130621597/baroposafewekudak.pdf
    • http://crepheats.com/uploads/1/3/0/7/130775222/xotobupewim.pdf
    • http://mistress-death.com/uploads/1/3/0/8/130814298/dewubekorufedilejuzi.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_off0000662b.bin
9f9e8055054914f1946e0b94844ac1f6e7933a9e3a3134835935e6c3fe1ef88a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662B 7612 bytes
font_01_sfnt_off000083e3.bin
8db3670d34ff0ff9e8b621cf79c91d9ad7af367e25d3bfe924b6f0daeb47538c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E3 16780 bytes

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