Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4115411744aedb6…

MALICIOUS

PDF

46.3 KB Created: 2020-03-10 10:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b01a25260bd1fb769c0a2d3b9ec654cf SHA-1: c1c26c359dc36ad23b2bc468d602301dc0b3ba7c SHA-256: b4115411744aedb6fe650df62394d4afddd83bd9b167efcf01fc2cf3751dd53e
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which are structured as SEO-friendly PDF links, suggesting a link farm or SEO scam. The document body, though heavily obfuscated, contains text related to engine power conversion and references the wkhtmltopdf tool, indicating a potential lure to external content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://hailifangbailigongyulecheng.br3h.com/uploads/1/3/0/3/130323222/130323222.html#engine+power+conversion+kw+to+hp
    • http://www.cullomcommunitymarket.com/uploads/1/3/0/5/130539479/2a4dd3d.pdf
    • http://armsandmindsrenovations.com/uploads/1/3/0/6/130639240/3527313.pdf
    • http://www.novelideapr.com/uploads/1/3/0/2/130270748/1680781.pdf
    • http://joangaeta.org/uploads/1/3/0/7/130775700/4228599.pdf
    • http://www.cre8festival.org/uploads/1/3/0/5/130538939/bc563.pdf
    • http://atelierjpb.com/uploads/1/3/0/6/130604344/feduten.pdf
    • http://ruthlessprogression.com/uploads/1/3/0/7/130739070/2363306.pdf
    • http://hendersoneyecare.org/uploads/1/3/0/3/130313169/9940368.pdf
    • http://februaryvioletseniors.com/uploads/1/3/0/6/130604113/zotowazoxu.pdf
    • http://bastion.co.nz/uploads/1/3/0/7/130739836/pakizewunavezis.pdf
    • http://mercedregionalvision.com/uploads/1/3/0/2/130270746/4135a.pdf
    • http://somethinghoppy.com/uploads/1/3/0/7/130775137/dulibapezobul-bevapawilibe-zitobovefebew-kovafobebataj.pdf
    • http://www.atajmil.com/uploads/1/3/0/6/130604109/6810473013acd2.pdf
    • http://opcloud.net/uploads/1/3/0/7/130776504/nijekepetadoma-xoxorevifo-petekubapiru-degixujiv.pdf
    • http://burzykowski.net/uploads/1/3/0/6/130639449/5763790.pdf
    • http://mywiguide.com/uploads/1/3/0/8/130873971/zogarupamuwe_wokuzen.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_off00007710.bin
dc43ffb1942f9e92064b7ac5903427510f645ddb38af9f1024c75d3f44d715ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7710 8792 bytes
font_01_sfnt_off0000963e.bin
82a3a46f933e995f911dd4cbac1192b3b895738b04e9bc70e593e2631f54df5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x963E 16152 bytes

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