Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d763aae7fcb38d…

MALICIOUS

PDF

37.9 KB Created: 2020-04-23 03:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: deba0c5b5898cc5e3f7c0b5346967714 SHA-1: d2bd2087a05a3e1002c1c5bfefcb3f25e1ac8257 SHA-256: 86d763aae7fcb38d431300dcfadce2786a03e3d57e35f7ff61f9563d48f92b36
136 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to other PDF files, suggesting a link farm or a distribution mechanism for malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may be attempting to trick users into believing they need a password to access an archive, a common tactic to bypass security scanners. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://inv-inv-inv.com/uploads/1/3/0/5/130550760/130550760.html#adobe+illustrator+cs5+kuyhaa
    • http://cycotron.com/uploads/1/3/0/5/130539203/4792790.pdf
    • http://coolwest.nl/uploads/1/3/1/3/131380004/kibufawonikepo.pdf
    • http://littlegreenwagon.com/uploads/1/3/0/2/130273573/fabat.pdf
    • http://hoodcanalcoffee.com/uploads/1/3/0/6/130621651/mujokeram-rovirozomato-faxeji-sudixafofipog.pdf
    • http://sacredsoulshine.com/uploads/1/3/1/3/131380054/3916589.pdf
    • http://yumkc.com/uploads/1/3/0/7/130738913/9a1e4.pdf
    • http://listershovslageri.se/uploads/1/3/1/6/131637517/6395007.pdf
    • http://atkhn.com/uploads/1/3/0/5/130589174/5352591.pdf
    • http://hellophotostudios.com/uploads/1/3/0/3/130323566/sabos.pdf
    • http://stylesnsmilessalon.org/uploads/1/3/1/4/131482878/4258319.pdf
    • http://spreadofbuddhism.com/uploads/1/3/0/2/130273571/fuguzamudegogol.pdf
    • http://jamesracer.com/uploads/1/3/0/3/130324112/xedivow_kakirixujomewor_muvukew.pdf
    • http://jerremy.net/uploads/1/3/0/6/130640236/166061b.pdf
    • http://bathby.com/uploads/1/3/0/4/130476447/57961fc9c7f.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_off00006724.bin
b2ed95b0762d6164b10db432d4db4b215dbead3bf8ad42bbe67b5d6180a913d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6724 9212 bytes

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