Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c37b4052577c7bf…

MALICIOUS

PDF

35.7 KB Created: 2020-04-07 08:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 20fbce6703e48133770230e72cc929b1 SHA-1: 108252a7a8835d76939901a18bc0c2a3ca3f63f3 SHA-256: 6c37b4052577c7bf8859cebcc4d1e02debdef3a4dd438f376c5a1d1df5ccf250
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDFs hosted on various domains, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://dimmocksretreat.com/uploads/1/3/0/6/130639034/130639034.html#que+son+las+maquiladoras+textiles
    • http://airbornelidarservices.com/uploads/1/3/0/7/130739777/1064920.pdf
    • http://aquaponicsrocks.com/uploads/1/3/0/6/130639408/zizujemebapotul-vosezuzu-gegoxiwu.pdf
    • http://prenatalmassageandcraniosacralmaui.com/uploads/1/3/0/8/130874325/b3d5db5026a867b.pdf
    • http://allergy.mediutopia.com/uploads/1/3/1/0/131070137/rirosajakonopa_tuvukexasitun_juzupilunurom_kexoxik.pdf
    • http://controlcompcostsnow.com/uploads/1/3/0/2/130289611/sananububuz.pdf
    • http://xerografx.com/uploads/1/3/0/6/130639947/wumipoleni_mamugo.pdf
    • http://rootsandradicles.com/uploads/1/3/0/7/130775772/tasuf_lozusimukezat.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_off0000604a.bin
d11d541a81890014d2de64a26a7f82a62d624a066ec2c4f41326d39268bab5ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604A 9008 bytes

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