Malicious PDF — malware analysis report

Static analysis result for SHA-256 790523247b9084c2…

MALICIOUS

PDF

40.8 KB Created: 2020-03-29 12:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9546623387342f25af597921904e97bb SHA-1: e904827e52f2bad613222b9c30fc1128aa3a5830 SHA-256: 790523247b9084c23709e59fdbb5e25114ddb9359bf1183dc8d711e17cdcee78
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a method to distribute malicious content indirectly. The ML classifier strongly flagged this PDF as malicious, supporting the observed link farming technique. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect users.

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://cfautobroker.com/uploads/1/3/0/4/130435777/130435777.html#dnd+5e+wild+surge+table
    • http://rachaelphillipsduetsch.com/uploads/1/3/0/6/130603926/73f79.pdf
    • http://wordproconsultancy.com/uploads/1/3/0/5/130543063/4961031.pdf
    • http://ayearofadventures.com/uploads/1/3/1/3/131380163/xonajevukobiril.pdf
    • http://mrsdunlapsscs.org/uploads/1/3/0/6/130622027/3368577.pdf
    • http://thefiprofessor.com/uploads/1/3/1/0/131070829/pexavamuz.pdf
    • http://salgsanitationliteracyghana.com/uploads/1/3/0/7/130775172/f2f1d2f68.pdf
    • http://experthousecleaningmelbournefl.com/uploads/1/3/0/9/130969149/jexovorinos.pdf
    • http://cartelivision.com/uploads/1/3/0/4/130488994/7566309.pdf
    • http://huntyearround.com/uploads/1/3/0/4/130488085/kewebamu-puxiros.pdf
    • http://lmntree.net/uploads/1/3/0/5/130539913/nifus_xiputodixepuvan_xumesazelaton.pdf
    • http://nathallybastos.com/uploads/1/3/0/7/130775629/vugazebubedurabis.pdf
    • http://walkerpavementcoatings.com/uploads/1/3/0/5/130551004/7585833.pdf
    • http://vikilab.lt/uploads/1/3/0/5/130539053/raruduxarutogi_vudop_vumibagedesek_nanomizu.pdf
    • http://craigcaveguitars.com/uploads/1/3/1/0/131071184/8bdb22dd4d1.pdf
    • http://mebinc.org/uploads/1/3/0/5/130542948/lurogulogurezusabuve.pdf
    • http://crafttyrelmarket.com/uploads/1/3/1/1/131164211/6e0378bcd893d.pdf
    • http://fmstrategiesllc.com/uploads/1/3/0/5/130539179/wusosinoso.pdf
    • http://trayjohnson.com/uploads/1/3/0/6/130605521/2615345.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_off000072b1.bin
e3f5d4a5f729e254b0145b0ebe9c9a68ca26b6ea36b10183afbd5fd68ac09509
pdf-font-stream PDF embedded font (sfnt) at offset 0x72B1 8900 bytes