Malicious PDF — malware analysis report

Static analysis result for SHA-256 923e7db4ea46414f…

MALICIOUS

PDF

41.2 KB Created: 2020-04-19 10:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e432d5e211bc34e511692f471bbf609d SHA-1: 34e1b89a8c9dee1ff8ce69bbbd709d2cbaaf13b1 SHA-256: 923e7db4ea46414fb767b9694aa7d5e84306af81c33862c57ddb96ab62725e4e
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to unrelated domains, characteristic of a link farm or SEO spam. The ML classifier strongly flagged this PDF as malicious. The document body text, though partially obfuscated, includes the phrase 'Personality disorder definition pdf' and references the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pasteleriaferovi.com/uploads/1/3/0/2/130270931/130270931.html#personality+disorder+definition+pdf
    • http://arthuraviation.com/uploads/1/3/0/6/130620587/jelixejajamuzaw.pdf
    • http://blueshoreinvestmentgroup.com/uploads/1/3/0/3/130323174/8407466.pdf
    • http://patglives2cook.com/uploads/1/3/1/0/131070774/kozijafewi.pdf
    • http://mystickerstuff.com/uploads/1/3/1/4/131410370/jafelifitim_xenelaxudot_werevararupura.pdf
    • http://missionjamescapitalllc.com/uploads/1/3/0/5/130539979/wamakumukaxuvirixolo.pdf
    • http://mdosteo.com/uploads/1/3/0/6/130604821/1c076fb4.pdf
    • http://touchfromaphrodite.com/uploads/1/3/1/3/131380210/tavavomekis_zipazofebim_bakufiwotibe.pdf
    • http://missionjamescapitalllc.com/uploads/1/3/0/5/130539979/wamakumukaxuvirixolo
    • 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_off000065e1.bin
53e2f291ee9a921271decd30a01ce56fb7ca0af4c3089a69f002939c28eaa32b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E1 7812 bytes
font_01_sfnt_off00008431.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8431 16036 bytes

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