Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad19f007efee84a9…

MALICIOUS

PDF

52.8 KB Created: 2020-03-22 03:03:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 97605013d34ef16097c9e5d883c86cdf SHA-1: 2ef56ee32b4602b6db17ffdc1ff753793be9741e SHA-256: ad19f007efee84a9c8779204c1a8eabbdaffbff4cad401f07ae31de24a3acd73
92 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, pointing to various domains. The ML_NYX_PDF_MALICIOUS classifier also strongly indicated maliciousness. The document body, though partially obfuscated, contains the title 'Esperanza matematica en probabilidad y estadistica' and references wkhtmltopdf, suggesting a lure document. The primary attack pattern involves redirecting the user to a link farm, likely for SEO poisoning or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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
  • 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://nepaawakening.net/uploads/1/3/0/4/130489358/130489358.html#esperanza+matematica+en+probabilidad+y+estadistica
    • http://mileagemaven.com/uploads/1/3/0/7/130774962/7005892.pdf
    • http://alphagroup.consulting/uploads/1/3/0/7/130739221/7933139.pdf
    • http://sadielakeevents.com/uploads/1/3/0/4/130488141/6102133.pdf
    • http://getstemcellinfo.com/uploads/1/3/0/8/130813094/1387600.pdf
    • http://relaysecurity.com/uploads/1/3/0/4/130483847/lozuk-buxapatezivirij-jevatomafemiji.pdf
    • http://www.spartansinglewoodwolves.com/uploads/1/3/0/5/130589040/434095.pdf
    • http://thelittleschoolproject.com/uploads/1/3/0/9/130969833/vemororu_nuvetomozajove_zomat.pdf
    • http://www.kjosa.us/uploads/1/3/0/5/130544447/fasutejuduxu-tiruvikewupivet.pdf
    • http://ignitefitness.info/uploads/1/3/0/6/130621279/4a5c5877e244.pdf
    • http://npnewbies.com/uploads/1/3/0/8/130815031/4732883.pdf
    • http://burke-llc.com/uploads/1/3/0/5/130588607/8312877.pdf
    • http://eeshv.eesforjobs.com/uploads/1/3/0/6/130604344/8767a3d4fc6.pdf
    • http://hostmaster.unexplainedjoy.com/uploads/1/3/0/8/130813798/3966833.pdf
    • http://humphreyscountyculturalmuseum.org/uploads/1/3/0/4/130483510/tebuwovarexawi-zobefasejifoja-jesavoxotuv.pdf
    • http://minimumtread.com/uploads/1/3/0/6/130621755/pajizuzuvona.pdf
    • http://traineronatrike.com/uploads/1/3/0/6/130639911/cbd6b5fc26.pdf
    • http://arkk.biz/uploads/1/3/0/6/130605504/8279375.pdf
    • http://burtandbrewington.com/uploads/1/3/0/3/130323156/d173b3c33.pdf
    • http://arrestekstil.com/uploads/1/3/0/7/130738778/vasatixapora.pdf
    • http://nutritionalbiochemistryresearchgroup.org/uploads/1/3/0/6/130621523/gedugabuburepip.pdf
    • http://howepropertymanagement.net/uploads/1/3/0/7/130775942/belegifafufo.pdf
    • http://www.motorkingauto.com/uploads/1/3/0/6/130639690/561e9.pdf
    • http://www.yingdesignstudio.com/uploads/1/3/0/7/130739935/255fcff770e0.pdf
    • http://ns2.whitehouse.edu.pk/uploads/1/3/0/5/130590541/62e828d645.pdf
    • http://ns2.whitehouse.edu.pk/up
    • 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_off00008051.bin
3aec9ff6d6c036179325c889b0faa6404d3f49bc6d5919ede30d8e378df0aee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8051 9452 bytes
font_01_sfnt_off0000a2ec.bin
63c669e10dd6169ba0d37950b4d66078befbc6d016383f5f1df6979ad38861ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2EC 3000 bytes
font_02_sfnt_off0000ad7f.bin
cbadadfc837eb6c758d077217bfbf158a98bdcd4108de75fb9034e1d6a9b9709		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7F 16064 bytes

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