Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a9f9073034c9e8…

MALICIOUS

PDF

47.4 KB Created: 2020-04-25 14:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb58b245c6dba31262ae31826425101c SHA-1: 25591b5a535237897939f0f7dae2138c1b4726aa SHA-256: 58a9f9073034c9e84227729d80c1e92970cab1d431b4e941f05ec3489fe268c4
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 PDFs. One embedded URL, 'http://chuysrestaurant.net/uploads/1/3/0/6/130620950/130620950.html#m18a1+claymore+mine+instruction+sheet', suggests a lure related to potentially dangerous content. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm and the ML score indicate a high likelihood of this document being used for malicious redirection or hosting further malware.

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://chuysrestaurant.net/uploads/1/3/0/6/130620950/130620950.html#m18a1+claymore+mine+instruction+sheet
    • http://hopefulkc.com/uploads/1/3/0/6/130620427/8ac74a055106612.pdf
    • http://votechuckvincent.com/uploads/1/3/0/4/130435500/sakovizavadanasofez.pdf
    • http://deluxeclosetscabinets.com/uploads/1/3/0/5/130550938/7290606.pdf
    • http://bndrzen.com/uploads/1/3/1/6/131607662/xepitaj_vipudixe_gopujodekufepe_namamubejufiz.pdf
    • http://erinwms.com/uploads/1/3/0/7/130775698/teropixab.pdf
    • http://goodmorningkampot.com/uploads/1/3/0/6/130621533/vawixevedu-faxofudeno.pdf
    • http://newenglandopportunityproject.org/uploads/1/3/0/2/130270845/9247881.pdf
    • http://jjhomez.com/uploads/1/3/0/8/130874680/4740607.pdf
    • http://rspmadison.org/uploads/1/3/1/4/131407012/95a7d96.pdf
    • http://skooterzandshooterz.com/uploads/1/3/1/1/131163898/velezijaxutejusuki.pdf
    • http://asherbay.com/uploads/1/3/1/6/131636677/9087632.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007be9.bin
0434f21caf8d65c0cf8b189bb30feb44ca15f1441c009a9617d0d6f809f24dff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE9 8512 bytes
font_01_sfnt_off00009c12.bin
bdf6e2a5114c77337cf2d71e474575abc22cba65a545e144b672baee1fd4a2cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C12 16088 bytes

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