Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bfb793cb9f3f13…

MALICIOUS

PDF

48.5 KB Created: 2020-03-23 13:28:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e45c7a1c9b181f42c0fc0d576ae6130c SHA-1: 577b61da36fd2510d2f6932db3a3d015bff0a64e SHA-256: d3bfb793cb9f3f13f257489284cbe16377d1048a9b2f0d813428c2d84e9df0bc
96 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, suggesting a link farm or SEO spam attack. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that is also listed among the extracted URLs. No scripts were extracted from this sample.

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://pharealrecords.com/uploads/1/3/0/5/130589161/130589161.html#propiedad+distributiva+de+la+multiplicacion+respecto+ala+suma+y+resta
    • http://hostmaster.arrows-sse.uk/uploads/1/3/0/2/130288600/vudiseruwotemawur.pdf
    • http://iferze.net/uploads/1/3/0/4/130483204/xirexobatapudob.pdf
    • http://alterationstotnes.com/uploads/1/3/0/5/130589317/13fc94c2ab.pdf
    • http://zhiboyule.chinasummercamp.org/uploads/1/3/0/3/130379299/6238200.pdf
    • http://charissaanggita.com/uploads/1/3/0/3/130323567/05995518.pdf
    • http://mydnchef.com/uploads/1/3/0/3/130379104/6891104.pdf
    • http://www.njsoccerhooligans.com/uploads/1/3/0/8/130814360/tawiba-vuzelunit-gubetiwuxitima.pdf
    • http://webmail.er4a2.net/uploads/1/3/0/4/130476135/99ea68ce.pdf
    • http://dsi-na.com/uploads/1/3/0/6/130620354/9ccd9ae5861.pdf
    • http://mfrtouch.net/uploads/1/3/0/7/130740232/394d3d835.pdf
    • http://kindermusikwithlorraine.com/uploads/1/3/0/6/130621782/nisefir.pdf
    • http://unwindpolefitness.com/uploads/1/3/0/9/130970015/bijogilefezawin_vawedele_tejixok.pdf
    • http://compound440r.net/uploads/1/3/0/8/130814562/8ce5ef3aca3071f.pdf
    • http://enormousevents.com/uploads/1/3/0/6/130640081/fd136a36ac3b.pdf
    • http://tltaphouse.com/uploads/1/3/0/7/130776874/96a84.pdf
    • http://simonemgenna.com/uploads/1/3/0/2/130272385/fiwofupoderepig.pdf
    • http://onefourau.com/uploads/1/3/0/5/130589047/bokifamofafolu-wuvuduvofipefo-nekutujuxiximi.pdf
    • http://maspc.org/uploads/1/3/0/3/130323603/489f909cbd7.pdf
    • http://britishgothictarot.us/uploads/1/3/0/2/130272483/5664574.pdf
    • http://fpcpontiac.org/uploads/1/3/0/9/130969480/depajamu.pdf
    • http://www.smartphonetripod.com/uploads/1/3/0/7/130776693/kenupisapobewazebaj.pdf
    • http://store.pennington.farm/uploads/1/3/0/6/130639068/vuworizedibe-zorupadenusu-nenuxavi.pdf
    • http://morandoopress.com/uploads/1/3/0/6/130639136/1098255.pdf
    • http://treasuredbydesignllc.com/uploads/1/3/0/7/130738780/685888535c.pdf
    • http://morandoopress.com/uploads/1/3/0/6/1306391
    • 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_off000074b8.bin
d7226b2f9f47779eb9084240e1f4af14d911e27a03101920aee79f7c58962069		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B8 8076 bytes
font_01_sfnt_off00009280.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9280 2652 bytes
font_02_sfnt_off00009be9.bin
b080e6aa9682ff87567a230b404ab00780bafcfd3ba11e3f536b788ca6e08ef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE9 16060 bytes

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