Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1694330bc8265cd…

MALICIOUS

PDF

36.0 KB Created: 2020-06-21 04:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ffa0dd56c951cc0d0421ff05ae7a711 SHA-1: b9d61f33f08c2414098078ee1b99bc27acb972b7 SHA-256: c1694330bc8265cd1f29dc9828124ef660124d5d5d0e8163cf817aed17a4ba02
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged by an ML classifier as malicious. It contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a link farm designed to redirect users. The primary intent appears to be to lure users to external sites, likely for phishing or malware delivery, as evidenced by the numerous unknown-reputation URLs.

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://tayanaschildcare.com/uploads/1/3/2/3/132302816/132302816.html#e83+004+datasheet
    • http://sub.emmajlark.com/uploads/1/3/0/4/130477839/lebunepez-kogivudixomobox.pdf
    • http://seminar-dropship.com/uploads/1/3/0/7/130775737/labokozuxen.pdf
    • http://hitzhome.com/uploads/1/3/0/5/130543240/fufuvufodipixapa.pdf
    • http://khaterahparwani.com/uploads/1/3/2/7/132740917/7160360.pdf
    • http://hoopcoconstruction.com.au/uploads/1/3/0/6/130621355/dovakeselomatopuma.pdf
    • http://frank.bristol.co.nz/uploads/1/3/0/4/130435570/bavifapoxibufesemik.pdf
    • http://modernaestheticservices.com/uploads/1/3/2/6/132681271/mivazesodu.pdf
    • http://insurancebybeyer.com/uploads/1/3/1/3/131383486/wivep_zofekotaze.pdf
    • http://lemondeetmoi.fr/uploads/1/3/1/0/131070867/730e7.pdf
    • http://hopplive.com/uploads/1/3/0/6/130621757/de416e3d7.pdf
    • http://puppycutzbyash.com/uploads/1/3/0/6/130640032/noluduzoba-zumeropi-sajep.pdf
    • http://nofone.net/uploads/1/3/1/6/131606331/6759693.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_off00004f17.bin
7224bd11d9fcf57635eb4bb57045dd9908874c40590560a8e18caf6527744d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F17 4852 bytes
font_01_sfnt_off00005f9b.bin
41705c8e97f956f183485af8ca36fc79dc0dcefa639eb80c2e44045e681d562a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9B 10664 bytes

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