Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f1ac9c33acb0f2…

MALICIOUS

PDF

38.4 KB Created: 2020-03-26 07:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a525818721b03da51119554ae651f5ab SHA-1: 9aa4f53267a4933b5710ba62c071691c8cb5329a SHA-256: 66f1ac9c33acb0f2d874525d4068c597905bbfe154b785284b0c902c5db2a59b
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm or SEO spam campaign, designed to manipulate search engine rankings or distribute malicious content. The ML classifier strongly supports the malicious verdict.

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://mightymindstutoring.net/uploads/1/3/0/5/130588467/130588467.html#todos+los+m%C3%BAltiplos+de+175
    • http://acmehempcompany.com/uploads/1/3/0/6/130620968/9823cd4514e6.pdf
    • http://www.theclothinggarage.com/uploads/1/3/0/9/130969738/0a46091bc76959.pdf
    • http://betweenfriendssalonandboutique.com/uploads/1/3/0/6/130604220/2470068.pdf
    • http://afforablehomesociety.com/uploads/1/3/0/2/130272240/fd2ea9446.pdf
    • http://urownadventure.com/uploads/1/3/0/7/130776358/maroforolewof_dobijuvazewof_batomisulatut.pdf
    • http://myrabi.com/uploads/1/3/0/7/130739731/fuzisamaxu_zetezivoxejen_tosiwosami.pdf
    • http://www.nvpackshop.com/uploads/1/3/0/3/130313319/9114649.pdf
    • http://mandyowen.net/uploads/1/3/0/5/130590535/9bffdf6.pdf
    • http://www.gourmetgoodies.us/uploads/1/3/0/5/130544725/bipatezul_pibakifet.pdf
    • http://eventurouspresents.com/uploads/1/3/0/7/130739265/88879.pdf
    • http://www.miss-stevens.com/uploads/1/3/1/0/131070220/1946572.pdf
    • http://batplanet.co.uk/uploads/1/3/0/7/130776230/4bcc17c771.pdf
    • http://pitchingnotes.com/uploads/1/3/0/3/130323220/wevibomibok.pdf
    • http://happynomads.com/uploads/1/3/0/5/130542729/ee040d0f821.pdf
    • http://bellevuefamilychiropractic.com/uploads/1/3/0/2/130272509/zojir.pdf
    • http://fairydreamgarden.com/uploads/1/3/0/5/130550827/nagifapelines.pdf
    • http://actwithpurpose.ca/uploads/1/3/0/8/130873833/gabidijiseziredezob.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_off00006c54.bin
fdbc3ef34aa29f31334193ed58f56549f97b94fc6ff69b2c06c49fc834304c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C54 8124 bytes

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