Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a0cfa945ff08e7…

MALICIOUS

PDF

38.1 KB Created: 2020-03-29 09:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 175c7f6b1330b4f22d9a98c52fe35624 SHA-1: 2d865b50fd060a1319b09371713a30bde8e1a71e SHA-256: 77a0cfa945ff08e79b8ee1435018d8927d6767f5c78eb57fb58e6ef3ad506046
96 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. The document body, though partially corrupted, contains text related to requesting a student status letter and includes a prominent URL. The ML classifier strongly indicates maliciousness, and the numerous links suggest a malicious intent, possibly for SEO spam or to redirect users to malicious sites.

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://blockchainambassador.ca/uploads/1/3/0/7/130776516/130776516.html#how+to+request+a+proof+of+student+status+letter
    • http://webmail.kilookas.com/uploads/1/3/0/6/130604175/keviven_kavujoxelada_wopam_rezuzija.pdf
    • http://gonggallery.com/uploads/1/3/0/6/130621217/8a802ef4.pdf
    • http://lydiaschmittrealtor.com/uploads/1/3/0/6/130621187/desagulunukalaj-mamegobagu-bozesovugusivas-volafok.pdf
    • http://parquesfunerales.com/uploads/1/3/0/5/130542870/6f3aa3bca6a415.pdf
    • http://indianabln.org/uploads/1/3/0/6/130621385/a19f8d4a9d.pdf
    • http://wovenunited.org/uploads/1/3/0/4/130489417/pelegokomazi_ruwunobof_fezibo_wimegaroli.pdf
    • http://fantasyalmanac.com/uploads/1/3/0/5/130590717/6329025.pdf
    • http://missitbeauty.co.uk/uploads/1/3/1/0/131071278/f08709a.pdf
    • http://beapreece.com/uploads/1/3/1/3/131383342/4457474.pdf
    • http://bubblebag-australia.com/uploads/1/3/0/2/130274338/pusubodasogimupij.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_off00006b38.bin
ccec7a41224d8e21e5c4958e083379ed36f7f89a8ef207ad58ffa1844a5c5e8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B38 8364 bytes

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