Malicious PDF — malware analysis report

Static analysis result for SHA-256 777d1e56ad71690d…

MALICIOUS

PDF

48.2 KB Created: 2020-03-22 13:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ee311e20835f950262e58608782086b5 SHA-1: afcb7c381c5a227cef2b3e01149c91498194ad68 SHA-256: 777d1e56ad71690d018b10bcbb79eae178571e0163466eb4b3934503fc5a12b9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam campaign. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'division problems for primary school', which is likely a lure to disguise the malicious intent of directing users to a network of potentially harmful websites.

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://referral360network.com/uploads/1/3/0/2/130288462/130288462.html#problemas+matematicos+de+division+para+cuarto+de+primaria
    • http://americanpawoutlet.com/uploads/1/3/0/5/130551214/475884.pdf
    • http://uw403b.com/uploads/1/3/0/4/130476462/gonoxiro.pdf
    • http://saishakticenter.com/uploads/1/3/0/5/130589435/lufuxoxewifarelumuvo.pdf
    • http://aprel8.world/uploads/1/3/0/5/130551176/e01a2f3.pdf
    • http://www.aprasint.com/uploads/1/3/0/7/130775386/sakifi-nagososo.pdf
    • http://cookingtwothrive.com/uploads/1/3/0/2/130272333/0e073d.pdf
    • http://artbydelayne.com/uploads/1/3/0/4/130476458/78783e3d45dc.pdf
    • http://4gwireless.com/uploads/1/3/0/7/130774973/denonunomaku.pdf
    • http://www.chandlervines.com.au/uploads/1/3/0/5/130589244/4fb15569bd.pdf
    • http://betterbookkeepingsolutions.net/uploads/1/3/0/5/130551153/pegawefi_tibupatupesogar_waxufazagavazi_bagid.pdf
    • http://loveforchinese.com/uploads/1/3/0/6/130639853/lotejoja.pdf
    • http://prestigepropertyconsultants.org/uploads/1/3/0/5/130590531/7423542f5.pdf
    • http://kathrynhearddesign.com/uploads/1/3/0/7/130739864/punagamibikag.pdf
    • http://mail.mountainvalleypaving.com/uploads/1/3/0/6/130639705/b2694f9d3f9e.pdf
    • http://isabellenash.net/uploads/1/3/0/4/130489706/cf7cf7a16064.pdf
    • http://oakdalepoolservice.com/uploads/1/3/0/7/130776749/nonisubewaxizo.pdf
    • http://circle-financial.info/uploads/1/3/1/0/131069766/jumudapufedife.pdf
    • http://auntybencookie.com/uploads/1/3/0/7/130775507/lotunezapozu-kodurure-gepuxugedurif-zanekuwaj.pdf
    • http://marijuanabudmarketonline.com/uploads/1/3/0/5/130544191/xigididulataliv.pdf
    • http://thealexispuhlick.com/uploads/1/3/0/8/130814248/wimodevof.pdf
    • http://thelink100.com/uploads/1/3/0/6/130639863/a2e0563c.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079e3.bin
cd2d20be42d307205e752a1bdd1716855659d2bad92f993fd03b01b6a3c39cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E3 9168 bytes
font_01_sfnt_off00009b25.bin
99c5a563bd14079918bfffdbdfd95054cabbef0c47e0e3eb61f716c3cd559389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B25 16124 bytes

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