Malicious PDF — malware analysis report

Static analysis result for SHA-256 438cc884571e9bf7…

MALICIOUS

PDF

37.2 KB Created: 2020-04-04 08:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bf130d96617ad013411c37fa4c29cc0d SHA-1: e7e97cf3d5bcd528e5959906ceda023c1fcc4edc SHA-256: 438cc884571e9bf72082a653735209f46dd773209840df23d5bf164511828d34
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to a book title and authoring application, suggesting a lure to disguise the malicious link farm. The primary attack pattern involves directing users to a multitude of external PDF files, likely for SEO manipulation or to distribute further malicious content.

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://phytoscape.com/uploads/1/3/1/3/131398253/131398253.html#norton+field+guide+to+writing+5th+ed
    • http://clicknimage.com/uploads/1/3/0/3/130379297/sivogedizilojozezima.pdf
    • http://schivi.de/uploads/1/3/0/3/130323403/4275928.pdf
    • http://quietstormcustomgear.com/uploads/1/3/0/3/130312971/runulezezi.pdf
    • http://grandmaandgrandpasinn.com/uploads/1/3/1/3/131380626/fitukekakinelon.pdf
    • http://bygma.lt/uploads/1/3/1/3/131379026/7503074.pdf
    • http://ginopavan.com/uploads/1/3/0/8/130874408/pufize-dexotumi-vajinevatozafu-zafapivijabumip.pdf
    • http://indiamartusa.com/uploads/1/3/0/2/130289322/266900.pdf
    • http://margiesfriedchicken.com/uploads/1/3/1/3/131381166/2820c6187.pdf
    • http://confederatelabs.com/uploads/1/3/0/7/130775902/daribegeworo.pdf
    • http://hautehuddle.com/uploads/1/3/0/7/130739951/pilasavuvubo-bozivil.pdf
    • http://djamescontracting.ca/uploads/1/3/0/6/130639241/82613451218b.pdf
    • http://sta-66-99-58-206.ladse.org/uploads/1/3/0/5/130588153/fibomi.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_off0000680a.bin
7ff07416cd396b6cba744af5d4cf3395ca6825217311f37f7e64468f4424afb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680A 7760 bytes

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