Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd42ad444788c29…

MALICIOUS

PDF

42.5 KB Created: 2020-03-27 09:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b6cea9b01eb5e1b67b960a7fe455f28 SHA-1: 8611e02e297c7585b9a874ea263bdcb86e09d39a SHA-256: 3bd42ad444788c29201ab82194ea16ec321dbe70fdf9faa5b87dc21bf139c0b0
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam campaign. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains several URLs that are also listed in the extracted URLs, reinforcing the 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://audiobookcon.com/uploads/1/3/0/5/130545573/130545573.html#museo+de+geolog%C3%ADa+santa+mar%C3%ADa+la+ribera+direccion
    • http://gapackagingandsupply.com/uploads/1/3/0/7/130739596/c3c36c.pdf
    • http://palmoil-expo.com/uploads/1/3/0/6/130639815/99da27f5942c1.pdf
    • http://lafortunaarenalhomes.com/uploads/1/3/0/6/130639148/9f719.pdf
    • http://www.aphrodesiaddict.com/uploads/1/3/0/5/130543740/vepomivupo_lagonewadalode.pdf
    • http://canak-kule.com/uploads/1/3/0/6/130621484/4058c47.pdf
    • http://ho168yulechengwangshangdubo.f18.ebkf.org/uploads/1/3/0/9/130969684/5acdeb.pdf
    • http://www.charliesopentalk.com/uploads/1/3/0/6/130621125/2273689.pdf
    • http://www.readingsbyannie.com/uploads/1/3/0/5/130551050/biluwewujalojukamo.pdf
    • http://queenoflimabeans.com/uploads/1/3/0/4/130483142/suvor_lunepowimol_muxobilofere_wenowitom.pdf
    • http://www.portsanluisaquaticcenter.org/uploads/1/3/0/6/130605204/b38b345c.pdf
    • http://highlandhillsms.com/uploads/1/3/0/2/130289569/2497091.pdf
    • http://2orgnzd.com/uploads/1/3/0/7/130776212/logelodeganijoxaku.pdf
    • http://www.jtabermanreiki.com/uploads/1/3/0/5/130551401/9593447.pdf
    • http://www.thebirthdaywagon-org.thomasemyers.com/uploads/1/3/0/9/130970004/zisaru-tinelaka.pdf
    • http://engagementguyconsulting.com/uploads/1/3/1/0/131070220/sizigezub.pdf
    • http://www.charleswriter.com/uploads/1/3/0/6/130604069/b0721df05.pdf
    • http://cellomusicdownloads.com/uploads/1/3/0/2/130270761/julenijazak-kosikologa-rixojamazati-kizumijif.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_off00007837.bin
bbd25cbb1995d9ff8d689014199c7a0abce29fa382e40018e4adc180f4f6b157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7837 9488 bytes

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