Malicious PDF — malware analysis report

Static analysis result for SHA-256 3880219c146d4eb3…

MALICIOUS

PDF

33.3 KB Created: 2020-03-20 13:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 23c39655a0650a90d4a3fd65af227db0 SHA-1: 53f23769d1091acbe0e6ff6f7e68436b886665ec SHA-256: 3880219c146d4eb36405a278f3dffd79a9ff46679c183dd8a94eb0075c397eb6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs point to various domains, suggesting a link farm or a distribution network for potentially malicious content. No scripts were extracted, and the document body is heavily obfuscated, but the sheer volume of external links is the primary indicator of malicious intent.

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://delgeinc.com/uploads/1/3/0/7/130776223/130776223.html#restaurants+in+bernville+pa
    • http://cyndibeetravel.com/uploads/1/3/0/6/130640022/9de9e7ceb1878e1.pdf
    • http://dispute.fun/uploads/1/3/0/3/130323405/xagagepujek.pdf
    • http://colsohpainters.com/uploads/1/3/0/9/130969521/cab7b19eac6.pdf
    • http://thexcollectivex.com/uploads/1/3/0/6/130604566/zidogav.pdf
    • http://www.ouachitariverchallenge.com/uploads/1/3/0/6/130604658/8ddc7.pdf
    • http://mail.r-1visa.com/uploads/1/3/0/8/130813373/jugus.pdf
    • http://davidjiang.us/uploads/1/3/0/2/130288381/vanafal_fuboxut.pdf
    • http://craigcole.com/uploads/1/3/0/6/130620965/gotivape.pdf
    • http://loreschuerman.com/uploads/1/3/1/0/131070852/kugises_defagidev_fepogizago.pdf
    • http://southernstylestudioandmore.com/uploads/1/3/0/8/130873976/3ffce117d5259c.pdf
    • http://www.committobetter.com/uploads/1/3/0/2/130287307/5371464.pdf
    • http://puertoescondidorefugio.org/uploads/1/3/0/7/130739500/ea5401.pdf
    • http://www.sewss.co.uk/uploads/1/3/0/5/130543462/117487.pdf
    • http://hbdurward.com/uploads/1/3/0/7/130739070/rokotomavubosisuxu.pdf
    • http://metcalfe4pa.org/uploads/1/3/0/8/130874305/5789749.pdf
    • http://www.lavc24-7.com/uploads/1/3/0/6/130639669/16fd3529df.pdf
    • http://chelseawarren.net/uploads/1/3/0/6/130620614/topovamogawimaxas.pdf
    • http://altucciresidents.com/uploads/1/3/0/5/130540097/lixidofape.pdf
    • http://pigenvy.com/uploads/1/3/0/6/130604025/3885322.pdf
    • http://innparadisekauai.com/uploads/1/3/0/7/130738913/33a99.pdf
    • http://n90.net/uploads/1/3/1/0/131069992/f9b256eec.pdf
    • http://reportageillustrator.com/uploads/1/3/0/4/130483957/3247078.pdf
    • http://researchmethodsinc.com/uploads/1/3/0/8/130873802/627526.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_off00005c2f.bin
6a366000bc4f249715869087b0bbdc200627befd171d1450e8c23d2731b08b39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C2F 6952 bytes

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