Malicious PDF — malware analysis report

Static analysis result for SHA-256 839b60ab65c77ed8…

MALICIOUS

PDF

59.4 KB Created: 2020-03-24 03:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1d57b4dd45acf287ae839dc37d015e22 SHA-1: f82735e02d4e84090a7f26852d89db7ce8f1c526 SHA-256: 839b60ab65c77ed801f7f4bb4295ac15672897f5cac806966e812f41f77414be
94 Risk Score

Malware Insights

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

This PDF document employs a link farm technique, embedding numerous external links that lead to other PDF files. The primary lure appears to be disguised as a search result for 'Net ionic equation for potassium phosphate and iron ii nitrate', directing users to a suspicious domain. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the mass linking behavior.

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://humanitariankits.online/uploads/1/3/0/4/130488469/130488469.html#net+ionic+equation+for+potassium+phosphate+and+iron+ii+nitrate
    • http://bubblesquad.net/uploads/1/3/0/3/130379423/139749.pdf
    • http://mycompanyblog.com/uploads/1/3/0/7/130775018/zirajosep.pdf
    • http://amhomesandproperties.com/uploads/1/3/0/4/130476738/werinafodixu.pdf
    • http://bluesskhe.studio/uploads/1/3/0/8/130873849/f918f320a680e.pdf
    • http://decheapertrash.com/uploads/1/3/0/5/130588378/efc1c83f7ac5d30.pdf
    • http://hong9yulechengfanshuiduoshao.br3h.com/uploads/1/3/0/6/130604887/zagifipawiwumud_ziwil_todipegukeze_kebaz.pdf
    • http://pleasureislandcruises.com/uploads/1/3/0/7/130775215/xawenikudavikibitamo.pdf
    • http://msmcelroy.net/uploads/1/3/0/4/130435807/gigubalivepivo-fetalujixoxunit-pugofediwixeno-kirabos.pdf
    • http://www.kelmaraircraftsales.com/uploads/1/3/0/4/130476721/3887751.pdf
    • http://storecbdproducts.com/uploads/1/3/0/7/130738822/koketakuvixexixase.pdf
    • http://theyearsbestwedding.com/uploads/1/3/0/5/130588830/ec8fc9f6.pdf
    • http://andrefootz.com/uploads/1/3/0/7/130739490/714735.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008fd0.bin
833c23272914c1fe500c108fefebded7caf1f6b7828944ab65826b3bbb34df64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD0 9456 bytes
font_01_sfnt_off0000b31e.bin
fe0dcda944e996aec996b560eb0dea605385280f05f6b493a918879507a9d0ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB31E 2908 bytes
font_02_sfnt_off0000bd4f.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4F 4144 bytes
font_03_sfnt_off0000ca45.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA45 16036 bytes

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