Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b6e38f2b7962f1…

MALICIOUS

PDF

40.7 KB Created: 2020-03-11 08:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f2301e40452604fdd911667943ec830b SHA-1: 0c2fc2cfaac85ee60f9eaaddb19474fca68e651a SHA-256: 75b6e38f2b7962f1be86136b57d904be7553f1306313309d60c2ce92e78217d2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many of which are dynamically generated and point to other PDFs, suggesting a link farm or redirection mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs indicates an attempt to direct users to potentially harmful external sites. The document body, though heavily obfuscated, contains text related to 'age problems with solutions pdf', likely a lure.

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://byt5a.bpmtc.com/uploads/1/3/0/9/130969175/130969175.html#age+problems+with+solutions+pdf
    • http://protectionmiracles.com/uploads/1/3/0/8/130813115/6494e26f.pdf
    • http://www.caylorarts.com/uploads/1/3/0/5/130590076/7615495.pdf
    • http://www.inretouch.studio/uploads/1/3/0/6/130603688/mawepuji.pdf
    • http://movement2people.dk/uploads/1/3/0/7/130738639/vutisunonuwegefuxut.pdf
    • http://living-sustainably.org/uploads/1/3/0/5/130550732/dbe96a0.pdf
    • http://www.artofthedead.net/uploads/1/3/0/5/130543453/41f405340402868.pdf
    • http://pomonazoningupdate.org/uploads/1/3/0/6/130604378/guvop_jojivesogeda.pdf
    • http://twinstopfashion.com/uploads/1/3/0/8/130813612/vivuribififome_jozutiranexesas_rememitujolizar_tukoxije.pdf
    • http://bpacontractorsme.com/uploads/1/3/0/5/130590779/rofoware-pigebomikeje-wirarutazixavil-woxitaxoposugow.pdf
    • http://rentscompete.com/uploads/1/3/0/3/130313235/xedamekaxuw_gizepal_kulodatu_tejefaruxamogat.pdf
    • http://summer-gao.com/uploads/1/3/0/7/130776724/261624.pdf
    • http://www.edrobinsonfamily.com/uploads/1/3/0/6/130621702/6198747.pdf
    • http://webmail.michiganhorsecouncil.com/uploads/1/3/0/6/130620991/dujugekuxelesegoked.pdf
    • http://relst-uhag66.com/uploads/1/3/0/5/130588527/ec08a011cc3d.pdf
    • http://midsummer7s.com/uploads/1/3/0/6/130639839/972517.pdf
    • http://tulnari.com/uploads/1/3/0/9/130969840/vuwijemizevomap-vuwejoralejiw.pdf
    • http://stavergroup.com/uploads/1/3/0/2/130270923/dekevogutamijif.pdf
    • http://xn-ig8h.com/uploads/1/3/0/2/130287872/fakajufageg.pdf
    • http://mobleads.net/uploads/1/3/1/0/131069777/sawetajixipe_wusipobulexage_netanol.pdf
    • http://travisnietert.com/uploads/1/3/0/8/130874495/420513.pdf
    • http://www.nathanbarot.com/uploads/1/3/0/2/130289630/3126429.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007703.bin
1cfb45d9d694a6f71dd587292ac33acec7a385839808d329ee284da869caa7f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7703 7892 bytes

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