Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae0ca0c118fd534…

MALICIOUS

PDF

37.9 KB Created: 2020-03-10 06:27:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 56e20a1adf9915e3ddee56c01a7832de SHA-1: a6bce63a097fab0e82f2bc3102d12e6209d3f241 SHA-256: 5ae0ca0c118fd5342629068d9abb89c52d7096870d5b4d2722949ae8f143254e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of external links to other PDF files, indicating a link farm or SEO spamming operation. The primary URL http://i05g5.salon225.com/uploads/1/3/0/2/130272631/130272631.html#free+spanish+worksheets+preterite+tense, along with numerous others, likely serves as a lure to download further malicious content or redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious.

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://i05g5.salon225.com/uploads/1/3/0/2/130272631/130272631.html#free+spanish+worksheets+preterite+tense
    • http://shantural.com/uploads/1/3/0/7/130776099/8443843.pdf
    • http://meyersmpg.com/uploads/1/3/0/5/130590467/718f9f7.pdf
    • http://myoptique2020.com/uploads/1/3/0/6/130603926/tefixosevazu.pdf
    • http://cbpanworks.com/uploads/1/3/0/7/130739483/1cb520af60d8.pdf
    • http://www.studiofourvernon.ca/uploads/1/3/0/4/130494172/689841.pdf
    • http://www.happyherbivorelife.com/uploads/1/3/0/4/130483480/75f8deead268ec.pdf
    • http://sustainableob.com/uploads/1/3/0/6/130605080/xafibubidurago.pdf
    • http://www.merchtrakr.com/uploads/1/3/0/3/130313066/9675860.pdf
    • http://lewiscbsolutions.com/uploads/1/3/0/8/130814687/5433051.pdf
    • http://chipfreeman.rpjandco.com/uploads/1/3/0/4/130435819/kawudixiz.pdf
    • http://ponoleadership.com/uploads/1/3/0/8/130813663/a399e594346ab.pdf
    • http://christianfung.com/uploads/1/3/0/7/130740066/82ba3.pdf
    • http://ericdietrich.com/uploads/1/3/0/6/130604820/549010.pdf
    • http://workforcecare.org/uploads/1/3/0/4/130435716/82f703f218.pdf
    • http://arbucklelakelodge.com/uploads/1/3/0/6/130604083/kuwepajijobebutenizi.pdf
    • http://savagesounds.net/uploads/1/3/0/3/130379347/pajop_zobawaguposofo_sozosev_tomirogifoza.pdf
    • http://www.cturology.com/uploads/1/3/0/3/130323412/legeme-pafiginu-pinugolabifavar.pdf
    • http://21stcenturycomposition.com/uploads/1/3/0/6/130620321/de017a3db994.pdf
    • http://9roundmemphis.com/uploads/1/3/0/2/130288731/e42da20b5b3b.pdf
    • http://weeditall.com/uploads/1/3/0/4/130476976/5124841.pdf
    • http://ewwcrust.com/uploads/1/3/0/4/130436093/63b102.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_off000068a6.bin
725e7afd29edd908dec88900d8d5d11266230c1aa22ed240f68abed70d7f765e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A6 9096 bytes

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