Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2baa28591ae0d9…

MALICIOUS

PDF

70.6 KB Created: 2020-04-02 02:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cd206cb354b9f34a8b7e2c3edc88e1d4 SHA-1: 8bee07c541f36eb7552a89b4cf39e72c9f6f81a3 SHA-256: 4c2baa28591ae0d97d4ebedd5bcb1a0f6f312e0934359a4f680c407f06d07dbe
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially obfuscated, contains references to URLs that are likely part of a link farm or SEO manipulation scheme. No scripts were extracted, and the primary malicious activity appears to be directing users to a wide array of external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://allianceforsustainabledevel.net/uploads/1/3/0/5/130551251/130551251.html#volumen+dodecaedro+regular
    • http://beachfrontmarket.com/uploads/1/3/0/6/130639477/eb1a938f3cb30.pdf
    • http://pinksticker.com/uploads/1/3/0/6/130604537/d01f642d1d.pdf
    • http://jessicagaul.com/uploads/1/3/0/4/130488395/198253.pdf
    • http://carypestpros.com/uploads/1/3/0/7/130739095/1146022.pdf
    • http://greatneckpsychotherapy.com/uploads/1/3/0/5/130544541/0b343.pdf
    • http://411161st.com/uploads/1/3/0/3/130379412/8e9aa061b.pdf
    • http://cleanerblue.com/uploads/1/3/1/0/131071072/wigexuve.pdf
    • http://sensecomposites.com/uploads/1/3/0/7/130775504/d74e8bdff7c8464.pdf
    • http://culturallyclassy.net/uploads/1/3/0/6/130620410/nevativ-gesubo.pdf
    • http://finanzas360.us/uploads/1/3/0/4/130476684/wezuluzorev.pdf
    • http://southerncrossland.com/uploads/1/3/0/2/130270900/726c4a.pdf
    • http://twistedmetalbuildz-autosales.com/uploads/1/3/0/6/130604153/7891443.pdf
    • http://ns.lyonsvet.com/uploads/1/3/0/7/130775949/lonaro-komofagujon-perapabefebib.pdf
    • http://topfairfaxdentists.com/uploads/1/3/0/2/130289172/tesojiwe.pdf
    • http://rockymountainresponse.com/uploads/1/3/1/4/131437130/xusaw_wikunapabetu_sesofonomaxowe.pdf
    • http://bradygazzome.com/uploads/1/3/1/4/131406662/dc462eaa1dcaf5.pdf
    • http://trvlphoto.com/uploads/1/3/0/7/130739001/1520824.pdf
    • http://mtsuaxo.org/uploads/1/3/0/6/130622120/bcc1f50.pdf
    • http://signaturepropertysolutions.net/uploads/1/3/0/6/130603815/nurokap.pdf
    • http://robertmcwhorter.com/uploads/1/3/0/3/130324315/nitaroz.pdf
    • http://www.kiddywinkskindy.org/uploads/1/3/0/7/130740232/xitekijiti.pdf
    • http://bellevuebraintrust.org/uploads/1/3/0/4/130435695/9d7095da2b54.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfb1.bin
3d24fea496fa978fb520f66b5c0ee8b1fa2e400785e067b8f3c49220e18ce44a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB1 12336 bytes
font_01_sfnt_off0000e8c6.bin
0ee47fbe442fd90a6e00ab51893572f3f676ef770974f2215f426322ae3d88e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 3400 bytes
font_02_sfnt_off0000f46b.bin
65b8d99f25fb5329138be2709bd29fef03dec6269283c34780d48541efe8ae66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 16208 bytes

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