Malicious PDF — malware analysis report

Static analysis result for SHA-256 67411fcb7de0cbe2…

MALICIOUS

PDF

45.6 KB Created: 2020-03-27 08:50:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 66b643a6c6c58051355a7c187673c2a4 SHA-1: d3a33cedbc993eaefc1cdc0415b49fba05b17f13 SHA-256: 67411fcb7de0cbe2b0fd1d2913fb66b3c6d0e684bfc72d6ab057d8de9b6079f5
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files with numeric slugs, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of outbound links suggests an attempt to redirect users to potentially malicious content or to manipulate search engine rankings.

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://oceanparkcreative.com/uploads/1/3/0/7/130776229/130776229.html#oraciones+coordinadas+simple+disyuntivas+10+ejemplos
    • http://shamrockcustomhouses.com/uploads/1/3/0/8/130813366/nogama.pdf
    • http://losangelesgafas.com/uploads/1/3/0/6/130620321/d8498.pdf
    • http://supportserbia.com/uploads/1/3/0/7/130775156/1692918.pdf
    • http://www.cakewalkcustoms.ca/uploads/1/3/0/2/130289259/6fc89844a2f0e.pdf
    • http://tasticle.com/uploads/1/3/0/2/130270893/sofugin.pdf
    • http://eefkeduin.nl/uploads/1/3/0/6/130639343/kikupajofuvux.pdf
    • http://travel.garylow.net/uploads/1/3/0/5/130588999/79c77bdd77f.pdf
    • http://multiplesclerosiscenterofsoutherncalifornia.net/uploads/1/3/0/6/130639283/5804314.pdf
    • http://uintahonlinek8.com/uploads/1/3/0/6/130639899/zisutelu.pdf
    • http://whereableart.com/uploads/1/3/0/7/130740617/raduzugab-gonarorufula.pdf
    • http://droneracingassoc.org/uploads/1/3/0/7/130739196/aa4d18d.pdf
    • http://nealhpatel.com/uploads/1/3/0/7/130776516/valuzumive-gafikivonomenu.pdf
    • http://jokebits.net/uploads/1/3/0/4/130483912/6947974.pdf
    • http://collegeonlinetutors.com/uploads/1/3/0/2/130288416/madiwefemoturef.pdf
    • http://justleafwell.com/uploads/1/3/0/5/130589219/4384961.pdf
    • http://kaneswriting.com/uploads/1/3/0/2/130288364/f5f6d.pdf
    • http://www.abbie-mae.com/uploads/1/3/0/3/130313293/boxezubaluzefiroka.pdf
    • http://bancodetalentos.org/uploads/1/3/0/5/130539202/4091323.pdf
    • http://soytco.com/uploads/1/3/0/5/130542936/4548947.pdf
    • http://jennagrober.com/uploads/1/3/0/3/130379447/vaxopovetulel_manadirinon_siradot.pdf
    • http://interpreterswithoutborders.net/uploads/1/3/0/5/130551463/1f1ea0a8af1ee.pdf
    • http://sospop.net/uploads/1/3/0/6/130639607/tomovalolaboxi_demuwuwisesugub_ketutik_kopulapanajefur.pdf
    • http://autodiscover.fpcmorganton.org/uploads/1/3/0/2/130291556/bixidatezibasisine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d82.bin
5f0a5cfeba7bafa559d64dbb2f3bd330e9c616ef5a83ce43e2a8aaa6099a458d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D82 8524 bytes
font_01_sfnt_off00009c5c.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5C 2652 bytes

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