Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da0915bbd9cc335…

MALICIOUS

PDF

44.3 KB Created: 2020-03-30 05:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 836388683ca49dbc8b58d206b9932aaf SHA-1: 1a00e60cae2a94cee47dac01e5ad69a149802c4b SHA-256: 7da0915bbd9cc3354684239386e53340d43f0a0d09b31ce5cd0b4b8517dbb746
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or redirection scheme. The ML classifier also strongly flagged this file as malicious. The embedded URLs likely serve as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://74-123-77-227.mgwnet.com/uploads/1/3/0/3/130323141/130323141.html#palabras+graves+que+no+llevan+acento
    • http://noahbearproduction.com/uploads/1/3/0/3/130313180/sadefivoxironab.pdf
    • http://bygamerzforgamerz.com/uploads/1/3/0/6/130640199/zujesevujumofom.pdf
    • http://citizensforspermresponsibility.org/uploads/1/3/0/8/130815026/goxorunufo_mufemate_xivuz.pdf
    • http://dianedurbin.com/uploads/1/3/0/5/130588885/fcf2bf40.pdf
    • http://liztongmft.com/uploads/1/3/0/5/130588182/difunuwefofavero.pdf
    • http://nobossmayor.com/uploads/1/3/0/6/130620525/goxovab_zoxebovarepavaw_sawubi_tovigeti.pdf
    • http://jalan2junkie.com/uploads/1/3/1/0/131070501/01052bf5ed2.pdf
    • http://sitemove556.com/uploads/1/3/0/5/130588545/donogifewekelikev.pdf
    • http://tudorestateshoa.com/uploads/1/3/0/4/130435982/045abb747aa6a.pdf
    • http://flyingbeauty.ch/uploads/1/3/0/6/130639526/zasivezeramepere.pdf
    • http://marrakeshtourguide.com/uploads/1/3/0/6/130620848/186ef9a2e20.pdf
    • http://regentforum.com/uploads/1/3/0/9/130969587/2016404.pdf
    • http://bigrockface.com/uploads/1/3/0/9/130969536/xemoxuwivezuwe-wemuxaxaju-muwaj.pdf
    • http://robertwinfree.com/uploads/1/3/0/5/130544751/wetok_gemeb_bexixukewa.pdf
    • http://lonelyowlreviews.com/uploads/1/3/0/5/130588999/wubawevuj.pdf
    • http://rbmcoaching.com/uploads/1/3/0/8/130814237/libixisiso_vuwawopu_besikudur.pdf
    • http://westhamlandscaping.com/uploads/1/3/0/5/130589115/1586739.pdf
    • http://camberwell.studio/uploads/1/3/0/6/130639153/wikudu.pdf
    • http://hrcconsulting.org/uploads/1/3/0/7/130776852/ecf43.pdf
    • http://sweetsbyjazz.com/uploads/1/3/0/7/130775903/fafizinupinaxor.pdf
    • http://hypotheekrekentool.nl/uploads/1/3/1/0/131069738/tonetaziz.pdf
    • http://sundown211.com/uploads/1/3/1/1/131163693/1490562.pdf
    • http://chestermarketblog.com/uploads/1/3/0/3/130379169/lodajinag.pdf
    • http://turlockwindowsanddoors.com/uploads/1/3/0/2/130289340/8528857.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_off00008051.bin
5b72a8144d4f0c64ff53c13de26baf82b6b5c0c00afed9ae9405e635a35aed4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8051 9360 bytes

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