Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d158feb5425d96…

MALICIOUS

PDF

37.9 KB Created: 2020-03-27 05:04:57 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f3acb378a8be94e4bd1381f15217f0ec SHA-1: 6295504dee740b0f1a6cdda463fae2c451177617 SHA-256: 91d158feb5425d9631756eeca42e6e1fcebe040d511b008a7953f541dfc32c3d
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The document body text is a lure, presenting itself as an answer key to a math book, while the embedded links point to numerous other PDF files hosted on various domains. This suggests a link farm or redirection scheme designed to distribute malware or engage in phishing. The ML classifier strongly supports the malicious verdict.

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://misssoutheastpageantry.us/uploads/1/3/0/5/130546196/130546196.html#eureka+math+book+grade+6+module+4+answer+key
    • http://windowssavvy.com/uploads/1/3/0/8/130874063/fawonemeruzupapuf.pdf
    • http://lightscameracreate.com/uploads/1/3/0/6/130639152/bovivami_zubenoj_lanopirado_nutaxidivaboju.pdf
    • http://amsplumbingheating.net/uploads/1/3/0/7/130775053/8785184.pdf
    • http://17ft.biz/uploads/1/3/0/2/130289682/12c42d451758a.pdf
    • http://completeprop.com/uploads/1/3/0/7/130775710/vukuzufurad.pdf
    • http://battlefielddarts.com/uploads/1/3/0/6/130639362/sedekomapino.pdf
    • http://www.chapter6.americansingercanary.com/uploads/1/3/0/4/130476288/e0ca2db19a1a.pdf
    • http://odinsolutionsintl.net/uploads/1/3/0/4/130477890/nipabagoweb_fexifemelunutu_sudupago_joturener.pdf
    • http://www.littlecornishbutton.co.uk/uploads/1/3/0/3/130323538/07602f.pdf
    • http://orgivemyselfdeath.com/uploads/1/3/0/6/130640032/abf71.pdf
    • http://folkturk.net/uploads/1/3/0/4/130436127/0fa991919e.pdf
    • http://cascadeladyhoops.com/uploads/1/3/0/6/130604631/kixotujexog.pdf
    • http://marzie.net/uploads/1/3/0/8/130814308/93b3b7df3e.pdf
    • http://wbagi.com/uploads/1/3/0/7/130738628/zisugoji_rajodesesilel_vibifiguta.pdf
    • http://jonathanholmesmd.com/uploads/1/3/0/7/130776269/fesuwodix_xuzevuvurid_tetudol.pdf
    • http://danieleporretta.com/uploads/1/3/0/9/130969699/kewisogusirap.pdf
    • http://campprepare.com/uploads/1/3/0/7/130775511/4044790.pdf
    • http://cowgirlchristmas.com/uploads/1/3/0/3/130379070/lalenupewamiz.pdf
    • http://ncmetalbuildingsdirect.com/uploads/1/3/0/6/130639814/babujogazonitiso.pdf
    • http://yourchinaguy.com/uploads/1/3/0/6/130620791/nokunefatesowuse.pdf
    • http://thehappyhealthylifeonline.com/uploads/1/3/0/2/130272853/9559351.pdf
    • http://manxfitness.net/uploads/1/3/0/6/130620668/femonamejese_tizujowama_pabaguvo.pdf
    • http://monicaariasmiranda.com/uploads/1/3/0/4/130488152/629cd12cb.pdf
    • http://flitchplateflitchbeam.com/uploads/1/3/0/4/130489262/wusigasepo.pdf
    • http://schanwriter.com/uploads/1/3/0/5/130546497/041f76b6cd0.pdf
    • http://monicaariasmiranda
    • 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_off00006e27.bin
6778e927503d94ea27154ea56954bc26d14d0e4ca7b023346e127fd9ccd84520		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E27 6844 bytes

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