Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ad1392f18667b6…

MALICIOUS

PDF

39.5 KB Created: 2020-03-25 13:14:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fa67e86465d6dcabdb0f3322ce8808f8 SHA-1: fab3fed38fd740015cd696d2951123fd626f77ad SHA-256: 14ad1392f18667b6e02ff25305a574daf89fed650461a8d8ed965486b500477d
136 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to other PDF files across various domains. This behavior is indicative of a link farm or SEO spam campaign, potentially designed to distribute malicious content or manipulate search engine results. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the numerous external links.

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://sanfranciscopeacetreaty.org/uploads/1/3/0/6/130639766/130639766.html#transact+sql+for+beginners+pdf
    • http://neonserwis.pl/uploads/1/3/0/5/130538842/gavetazagidulonu.pdf
    • http://dwandcompany.net/uploads/1/3/0/4/130494743/remomebovefat-vozeva-xufuk.pdf
    • http://michaelcranefastliferecordsllc.com/uploads/1/3/0/2/130271179/9917181.pdf
    • http://millikenentertainment.net/uploads/1/3/0/4/130488362/fuzujo_veziguk.pdf
    • http://www.tuckerrash.ronrash.com/uploads/1/3/0/6/130639312/4245799.pdf
    • http://giftsnobs.com/uploads/1/3/0/8/130814401/matapagiwanuso.pdf
    • http://keynote.jenniferettinger.com/uploads/1/3/0/2/130272509/27ee71ff37e5d1b.pdf
    • http://tippopotamus.com/uploads/1/3/0/6/130640128/relokilubip_dudazoposudolur.pdf
    • http://mx.immlawcounsel.com/uploads/1/3/0/4/130489564/gilavun-sipejukewekux.pdf
    • http://three-ps-in-a-pod.com/uploads/1/3/0/6/130604986/8976414.pdf
    • http://niedfulthings.com/uploads/1/3/0/6/130639272/6e80ebd96d06d.pdf
    • http://www.superproductionchallenge.ca/uploads/1/3/0/2/130272296/1590459.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_off00007158.bin
181b267996eabe0a4fc0c774c429a01347218afa78733e9e867ba6945fc1637d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7158 8260 bytes

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