Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be9b38a658de2d3…

MALICIOUS

PDF

39.8 KB Created: 2020-03-29 09:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 364eb5757ac7b1e45bb467fa4568954a SHA-1: 71673e3a51329157f05b9e77b266007c8173b6ba SHA-256: 5be9b38a658de2d3505ab8703405dc96e2346b17fbf84ac25dce1c118f707aeb
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, forming a link farm, which is a common technique for distributing malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be intended to trick users into believing they need a password to access content, likely to bypass security scanners. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://host115.carmichaelnl.com/uploads/1/3/0/5/130547078/130547078.html#o+que+significa+s%C3%ADmbolo+simbologia
    • http://snirts.xyz/uploads/1/3/0/2/130291658/f06b2.pdf
    • http://relief-at-hand.com/uploads/1/3/1/1/131164238/2448851.pdf
    • http://x-residency.com/uploads/1/3/0/6/130621591/wenujikajal.pdf
    • http://thesquirrelsnest.net/uploads/1/3/0/6/130621031/5041299.pdf
    • http://www.communityvaluesderry.com/uploads/1/3/0/6/130621500/4637b6.pdf
    • http://meredithsasseen.com/uploads/1/3/0/3/130312952/kigiwumode.pdf
    • http://guelcreations.com/uploads/1/3/0/3/130324324/xevag_defubogodagozip.pdf
    • http://cashingproperties.net/uploads/1/3/0/6/130639143/rozuzep_dezen_watevosetogi_zakivixopapep.pdf
    • http://www.ens.net.au/uploads/1/3/0/6/130605476/nitasoxe_wezarek_rafeso_sezepefuwevi.pdf
    • http://drinkingnthinking.com/uploads/1/3/1/1/131163533/ladefebukuvap.pdf
    • http://davinsplace.com/uploads/1/3/0/5/130539059/8495897.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_off00006d6f.bin
05f3dc017cdf033b285b009db7f2266a4c7f852e56b21bc1ee51dc60a771a225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6F 10820 bytes

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