Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e63ea1cb636d32…

MALICIOUS

PDF

39.6 KB Created: 2020-06-14 14:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d077641ab083db1300108e5b7b43dc8f SHA-1: a7aeb98cbce448f57d338d59b9bc73fb1cbdeaa5 SHA-256: 66e63ea1cb636d321e8eae6bd975eced9d523a684ac051c9e30a0f69bef793c0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, many of which point to other PDF files. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings. The primary attack pattern appears to be a link farm or SEO manipulation, potentially distributing malicious content or leading to phishing sites.

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://guanjunyulebaijiale.br3h.com/uploads/1/3/0/4/130488500/130488500.html#companion+planting+guide+pdf
    • http://2artrooms.com/uploads/1/3/0/3/130323599/5cbd3e4f70.pdf
    • http://gienekeyeshomes.com/uploads/1/3/1/6/131606039/xazukijaju.pdf
    • http://littlejoesjanitorialrental.ca/uploads/1/3/1/6/131606298/5f42d3d48ca95.pdf
    • http://diamondskillsacademy.com/uploads/1/3/0/7/130739904/tonelixi.pdf
    • http://christinescott.info/uploads/1/3/0/5/130550938/5877221.pdf
    • http://mspurbanloftoffice.com/uploads/1/3/1/6/131606201/bojul_wuvadanemobis_retatedem_wapeselow.pdf
    • http://treehousegreatoceanroad.com/uploads/1/3/0/2/130289793/b18e05ef1.pdf
    • http://teeshirtonbyjnrprints.com/uploads/1/3/0/3/130324075/dusetakalisa_bulusen_dofate_kirabuxibegekil.pdf
    • http://ellenkochyoga.com/uploads/1/3/1/3/131381151/sipewovoze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://divasojawi.files.wordpress.com/2020/06/suwobonuwovam.pdf
    • https://wapisamuvubu.files.wordpress.com/2020/06/niruvesonolazerolar.pdf
    • https://bizupugol.files.wordpress.com/2020/06/19213318643.pdf
    • https://muxuzejut.files.wordpress.com/2020/06/kibefaj.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fdb.bin
75c8ccd2873d174e17170123c1804e60b473de2368c4b134df125e9ce52bac64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDB 10260 bytes

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