Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c55da916f5dd7f7…

MALICIOUS

PDF

36.9 KB Created: 2020-06-02 18:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e62892cf44dc49555f44036beebee553 SHA-1: e99ebd6c7d6bda456c15459b747dd3fb881e03d7 SHA-256: 6c55da916f5dd7f7ddd74ffe02a569301c052a6aba7046eb90fe0668e54dbccf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by an ML classifier and contains a large number of external links, indicative of a link farm or SEO spam campaign. The primary purpose appears to be directing users to various external PDF documents hosted on unrelated domains. No scripts were extracted, and the document body contained mostly metadata and garbled text, making it difficult to ascertain a more specific lure.

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://mta-sts.lotusandbee.com/uploads/1/3/1/6/131607703/131607703.html#graco+stanton+crib
    • http://acupuncture4health.co.uk/uploads/1/3/1/6/131606218/wewigefo-dadifizemewo.pdf
    • http://bitsnbytesindia.com/uploads/1/3/0/6/130604010/pepurotuporur_govafanizujet_wonabukaka_jugaxanagug.pdf
    • http://setonsandsholidayhomes.com/uploads/1/3/1/3/131380086/5433570.pdf
    • http://houston.houstonsgreenhouse.com/uploads/1/3/0/5/130588599/budosoxu_bomefevigusapiv_sefewu_minomuxalifufaw.pdf
    • http://qdroqueen.com/uploads/1/3/1/3/131379555/786757.pdf
    • http://kerilyngrant.com/uploads/1/3/0/2/130288565/4fffe36fa2d11.pdf
    • http://juliespetsittingdogwalking.net/uploads/1/3/0/4/130478259/wanemazojigivo.pdf
    • http://motorcityoctane.com/uploads/1/3/1/6/131637395/1356835.pdf
    • http://mta-sts.lotusandbee.com/uploads/1/3/1/6/131607703/terms.html
    • http://mta-sts.lotusandbee.com/uploads/1/3/1/6/131607703/dmca.html
    • http://mta-sts.lotusandbee.com/uploads/1/3/1/6/131607703/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://xowagibiwu.files.wordpress.com/2020/05/zigipujimaxowanipen.pdf
    • https://timowasufu57836677.files.wordpress.com/2020/05/91817877545.pdf
    • https://rojevaliri.files.wordpress.com/2020/05/40487962543.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f3f.bin
0f4e4b68680a4cb37bb2d759e751aaf08401c4c72f0cc86393a5e7956f49b3d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3F 12216 bytes

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