Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d89084ff2c0082a…

MALICIOUS

PDF

68.0 KB Created: 2020-04-28 20:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3350677b6f55e005b75d40f68796e2c0 SHA-1: dc338b08cdb8b088a2091ae0990bce788ea935a5 SHA-256: 4d89084ff2c0082a70443f29ebf7aa278ac407f31e8b46dd762c95f8a3d349cd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier strongly indicates maliciousness. The embedded URLs suggest a link farm or SEO manipulation tactic, potentially used to distribute further malicious content or improve search rankings for malicious sites. No scripts were extracted from this sample.

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://officerethink.com/uploads/1/3/0/5/130588885/130588885.html#blog+template+examples
    • http://williamlauto.com/uploads/1/3/0/3/130379146/wuputugotiked-wakasosaridume-felebig-girunu.pdf
    • http://arc-hawaii.com/uploads/1/3/0/7/130775610/bevujemenenifikevum.pdf
    • http://browbeautybykimberlya.com/uploads/1/3/1/3/131381555/5770d17.pdf
    • http://ozzypainting.com/uploads/1/3/0/6/130605289/jirikole.pdf
    • http://hallmarksconsultancy.com/uploads/1/3/0/3/130324206/kabalojoxepu.pdf
    • http://suor.pt/uploads/1/3/0/7/130776031/zilavejazoni_kedufupi.pdf
    • http://mayangoddess.net/uploads/1/3/0/9/130968931/zuxexolesesekin.pdf
    • http://cpeliteacademy.com/uploads/1/3/0/7/130740623/xafazugejotadigana.pdf
    • http://mtdhub.com/uploads/1/3/0/4/130488220/luweweruda-zaduweba-gopimomabijevaf-fejoraguluni.pdf
    • http://timesharememes.com/uploads/1/3/0/6/130620598/d2248.pdf
    • http://lilafy.com/uploads/1/3/1/8/131872084/c470b1ad.pdf
    • http://electricalcodeservicesllc.com/uploads/1/3/0/8/130814715/079244ac39.pdf
    • http://be-wellaccessories.ca/uploads/1/3/0/7/130776449/e732e842.pdf
    • http://pope-culminating.com/uploads/1/3/0/6/130605504/3509297.pdf
    • http://jasperandthekids.com/uploads/1/3/0/9/130969876/pixipanenowapenife.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_off0000e244.bin
19e6d8d8669e2f1c73d0b3c0b6f064ccac7ff7a0cf3bcab6843be59ad96c8efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE244 8784 bytes

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