Malicious PDF — malware analysis report

Static analysis result for SHA-256 2454daa81646e13c…

MALICIOUS

PDF

40.9 KB Created: 2020-06-15 13:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdb3e5246122181bdb6ea6750a6a9a0d SHA-1: b62cb872c6dbc8d8c3fcdedcb2826cd328aa2211 SHA-256: 2454daa81646e13ce44c4c0cb4ba8e1edc8f78d6ac25f278a0858cc52e36dafa
94 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, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains several URLs that are part of this link farm. The primary attack pattern appears to be the creation of a link farm, likely to manipulate search engine results or to distribute further malicious content through the linked PDFs.

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://odriscollassets.com/uploads/1/3/0/8/130814195/130814195.html#fiddle+lessons+double+stops
    • http://projectsilvermentalhealthwellness.org/uploads/1/3/0/5/130539428/7552054.pdf
    • http://thewholelifementor.com/uploads/1/3/1/4/131406985/4519946.pdf
    • http://higginshomeservices.com/uploads/1/3/1/6/131637477/mazupejejok_zazaju.pdf
    • http://fitindie.com/uploads/1/3/0/2/130291328/ede843e2156.pdf
    • http://affordable-designbuild.com/uploads/1/3/0/5/130539269/vizekugizajuzuka.pdf
    • http://rebjohnson.com/uploads/1/3/0/5/130589058/3826874.pdf
    • http://34o.undesirable.us/uploads/1/3/0/6/130604355/3a77f84.pdf
    • http://justraze.com/uploads/1/3/0/5/130543453/5846878.pdf
    • http://swineandvinefarm.com/uploads/1/3/1/4/131437421/zumaxapirapuzej_nuvofaguwo_dolab.pdf
    • http://vps11-internal.pleasingfood.com/uploads/1/3/0/5/130541688/jokadal_ruwefupofu_vejujidenupu.pdf
    • https://duwarorifo.files.wordpress.com/2020/06/39939202448.pdf
    • https://sujerejuziv.files.wordpress.com/2020/06/38512580120.pdf
    • https://kugomiregu812748447.files.wordpress.com/2020/06/91807908475.pdf
    • https://fapodafa.files.wordpress.com/2020/06/4127979467.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_off00007423.bin
b7e9868406125a29073c02b0c52393385ae179e8a47c1b7310fc2b02a06a8e3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7423 10116 bytes

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