Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5965754bf8d7b6…

MALICIOUS

PDF

85.9 KB Created: 2020-03-15 00:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: af0595bf995f81e04d0061c83f9dc08e SHA-1: 0751b989cc7cef8f1fb0b7ef5757b90e55fde609 SHA-256: 5c5965754bf8d7b6fee84f9b40c4a9119e70132f7b4300375ee120dc3e26f8da
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files with numeric slugs, indicative of a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports its malicious intent. The document body contains obfuscated text and a URL that appears to be part of the lure.

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://adsl-63-204-18-1.benefitplans.org/uploads/1/3/0/9/130969146/130969146.html#bescherelle+conjugaison+pdf+pobierz
    • http://conradarchitectureanddesign.com/uploads/1/3/0/7/130775297/wenanuzo.pdf
    • http://rainbowkids-okinawa.org/uploads/1/3/0/3/130323511/kagofesul_sawinu.pdf
    • http://mta-sts.mail.catherinehodge.com/uploads/1/3/0/6/130620320/munanomoxoseb.pdf
    • http://cslsolution.net/uploads/1/3/0/3/130323281/megolu_zexalav.pdf
    • http://davidpgeorgi.com/uploads/1/3/0/7/130776222/619eba4386.pdf
    • http://lilyleclaire.com/uploads/1/3/0/7/130775679/c2846b37bf9a.pdf
    • http://emmalingle.com/uploads/1/3/0/6/130621164/fasudut-xuboke-divunixaw-demuderano.pdf
    • http://centurycityoptometry.net/uploads/1/3/0/6/130639616/pusawafowuzifesu.pdf
    • http://garageconversionoxfordshire.co.uk/uploads/1/3/0/4/130488410/pipofenubopazeluzas.pdf
    • http://metromedicalmassage.com/uploads/1/3/0/6/130621304/refekigatorob.pdf
    • http://coloniakiters.com/uploads/1/3/0/5/130543941/d00518d73f7.pdf
    • http://whosrunningamerica.net/uploads/1/3/0/4/130476485/0b0b224045.pdf
    • http://www.airstreamexpress.com/uploads/1/3/0/3/130323110/tanoloraveluju.pdf
    • http://ryanbeil.com/uploads/1/3/0/6/130639385/rulejiwuwezasa.pdf
    • http://sophietang.com/uploads/1/3/0/4/130489082/8254495.pdf
    • http://monicatriplettfineart.com/uploads/1/3/0/6/130604109/vebij_kotinije.pdf
    • http://www.liveactionmedia.co.uk/uploads/1/3/0/3/130323208/3363384.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_off000116c2.bin
81bf52c768ef3c28ff0e279780174bcc1ed12b1aa14b08d7a59365093814b854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C2 15264 bytes

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