Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a80b987dd12e757…

MALICIOUS

PDF

40.4 KB Created: 2020-03-08 02:31:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bfbb76bb2da828e25332f7a8dd736443 SHA-1: 954c39eaeb7c352e1119ed5de3a475b408e4163c SHA-256: 7a80b987dd12e757a3547c7cc154455312dfe7818c0ef460e3e4dc2b9093ff9c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external URLs, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the sheer volume of URLs points to a 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://sdsufiji.com/uploads/1/3/0/7/130774981/130774981.html#area+and+perimeter+worksheets+grade+4+with+answers
    • http://robertdesigner.com/uploads/1/3/0/2/130271243/f75f07f020.pdf
    • http://nhantienquocte-vn.online/uploads/1/3/0/2/130287923/71e8bb102.pdf
    • http://drallison.com/uploads/1/3/0/2/130289421/funepogugesoguf.pdf
    • http://a2zinteriors.org/uploads/1/3/0/5/130550748/redadofat.pdf
    • http://spice-sisters.com/uploads/1/3/0/5/130588518/4575899.pdf
    • http://soundsleepformula.com/uploads/1/3/0/8/130873849/konit.pdf
    • http://caymansonline.com/uploads/1/3/0/4/130477083/gukegosavupad-dorurisukiwiwan.pdf
    • http://rockhammerhdd.us/uploads/1/3/0/5/130588258/1176952.pdf
    • http://pakscreen.com/uploads/1/3/0/2/130273803/8315689.pdf
    • http://pickleskis.com/uploads/1/3/0/5/130551981/lixotaz.pdf
    • http://sfte-seattle.org/uploads/1/3/0/3/130379431/e53c2f6d5ba8ae.pdf
    • http://sjnbasketball.org/uploads/1/3/0/6/130605133/nagijutotajale-wenofolemub-wifapesopa.pdf
    • http://hostmaster.taintless.co.uk/uploads/1/3/1/0/131070398/nozinegufiwukak.pdf
    • http://lakesideranchandresortfl.com/uploads/1/3/0/4/130476146/pobuxesotivu-lononomo-nuvok.pdf
    • http://horizonunitedgroupinc.com/uploads/1/3/0/9/130969176/7fc89dde035267f.pdf
    • http://parallaxpmo.com/uploads/1/3/0/5/130542727/f44e55f2d.pdf
    • http://newseynessa.com/uploads/1/3/0/7/130776349/juzolibuwapaxuf_rizew_xufibozazedib_fewigut.pdf
    • http://stickermunk.com/uploads/1/3/0/3/130323384/nawibudineboz_fotifif.pdf
    • http://cozycraftyboutique.com/uploads/1/3/0/7/130776641/pivaroxosufef-vagipojonog.pdf
    • http://lenoraziegler.net/uploads/1/3/0/5/130588620/fapegisiwupulov-zagegigoni-fogikajo.pdf
    • http://mishareads.com/uploads/1/3/0/6/130621226/pekixawadumuw.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_off000076e3.bin
33a5cc7276a27512a96c5d905a580adb95386e141acefdce1ac7aad788697527		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E3 7388 bytes

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