Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f63784a8fe7793…

MALICIOUS

PDF

41.5 KB Created: 2020-04-27 02:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f78df0548eda6f99ba9034389664f257 SHA-1: 746b19c423fee8ad8d558f58d63172507722bf98 SHA-256: d5f63784a8fe7793be9f445186064f8426653e3e478fd1c5c54a7dacfd758513
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDF files on domains like pcdclient.com and others. This behavior is indicative of a link farm or SEO spam technique, often used to distribute malicious content or for phishing. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that the embedded links are intended for malicious purposes.

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://alonsorios.com/uploads/1/3/0/3/130379138/130379138.html#aha+guidelines+valvular+heart+disease+2017
    • http://pcdclient.com/uploads/1/3/0/3/130313588/7567626.pdf
    • http://pet-sit.org/uploads/1/3/0/4/130488810/damuz.pdf
    • http://sweetrockymountain.com/uploads/1/3/0/7/130739141/soliribi_jixoba.pdf
    • http://gablehorse.net/uploads/1/3/0/4/130475994/lanivim_koxazelete_kofozuja.pdf
    • http://melmadotcom.com/uploads/1/3/0/7/130775509/detabojod_dalet.pdf
    • http://mariaaki.com/uploads/1/3/1/3/131381151/janetezu-lofenusoxegile-fuketiboteliga.pdf
    • http://corporatebae.com/uploads/1/3/0/7/130776698/bebemugatox.pdf
    • http://support-de-facturation.net/uploads/1/3/0/7/130740113/2334072.pdf
    • http://maineharborseals.com/uploads/1/3/0/4/130490875/8063342.pdf
    • http://bassendeangourmetmeats.com/uploads/1/3/1/4/131438120/4735660.pdf
    • http://creativespeechcompany.com/uploads/1/3/1/6/131636977/vukutaxolebawi.pdf
    • http://stranocarpentry.com/uploads/1/3/0/3/130379841/bf8afda74bd.pdf
    • http://dayofaqueen.org/uploads/1/3/1/0/131070401/3192061.pdf
    • http://maineharborse
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006535.bin
76bb755b7aa8c28113539706629f9aec6ad053121b79eb84179a983ca70fe06d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6535 8312 bytes
font_01_sfnt_off000084e6.bin
ddc6c38a5929b263b215a5b0c7aa8b1a409f146866f06980111f9f21a6232bf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84E6 16036 bytes

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