Malicious PDF — malware analysis report

Static analysis result for SHA-256 4701eefd742b2c14…

MALICIOUS

PDF

42.5 KB Created: 2020-03-07 20:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 304842ec5fcc6786a5fb52d23e299ced SHA-1: ff25783fbf02f059d3bb46d1c41fb7a797af48c6 SHA-256: 4701eefd742b2c148ebee61520ad4b5d300b6050463bb6ec7b063731503bb3fa
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to direct users to malicious sites. The document body, though partially corrupted, contains text suggesting a lure for 'historical romance free online read', which is likely a pretext to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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://pingboguojiguanwang.br3h.com/uploads/1/3/0/6/130604020/130604020.html#harlequin+historical+romance+free+online+read
    • http://wirelesstudios.com/uploads/1/3/0/3/130379743/9ebd9b718.pdf
    • http://sarahloudesigns.com/uploads/1/3/0/5/130589391/8268a3.pdf
    • http://northcoastwalkingtours.com/uploads/1/3/0/5/130543121/d98607743e6d1fb.pdf
    • http://nobros.net/uploads/1/3/0/2/130271131/988447d39c39c1.pdf
    • http://www.eprivatum.com/uploads/1/3/0/4/130483879/nuwawegew.pdf
    • http://watersportsrep.com/uploads/1/3/0/2/130289236/vipuwoxipalo.pdf
    • http://muevetefacil.com/uploads/1/3/0/5/130590391/depekafabimela.pdf
    • http://shine-bu.com/uploads/1/3/0/4/130488662/2c0d604a.pdf
    • http://chocolatecsa.com/uploads/1/3/0/4/130488396/f2ee62cf03c.pdf
    • http://globalmacroinvestments.com/uploads/1/3/0/4/130476417/jomokivinifilitigib.pdf
    • http://stickittolennon.com/uploads/1/3/0/8/130814623/sesigosarelori.pdf
    • http://mikelindenthal.com/uploads/1/3/0/4/130436095/523925.pdf
    • http://mta-sts.mail.thefunkyplanet.com/uploads/1/3/0/5/130589251/4c7a98.pdf
    • http://columbushardscapes.com/uploads/1/3/0/5/130588599/015821a821877.pdf
    • http://www.mbcatering.net/uploads/1/3/0/6/130603803/7765679.pdf
    • http://deidras5hometownsparkle.com/uploads/1/3/0/2/130271047/2298763.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_off00007c1a.bin
426402936d1b20d57bbfff7fa01df43c1cc392467f97f59420a58331619c68ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1A 8420 bytes

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